We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
too long iban generated for pl-PL locale
* Faker version: 9.8.2
* OS: MacOs 12.0.1

IBANs generated for pl_PL locales are 30 characters long. This is too many. Valid PL IBAN should have 28 characters (including country code).

### Steps to reproduce
Generate a Polish IBAN with:
```
from faker import Faker
  fake=Faker('pl-PL')
  print(fake.iban())
```
Copy paste generated string into IBAN Validator at https://www.ibancalculator.com/
### Expected behavior

IBAN should have the correct length and checksum

### Actual behavior

There is an error message that IBAN have too many characters:
"This IBAN cannot be correct because of its length. A Polish IBAN always contains exactly 28 digits and letters ("PL", a 2-digit checksum, and the 24-digit national account number, whose first 8 digits determine the bank and branch). The IBAN you entered is 30 characters long."

too long iban generated for pl-PL locale
* Faker version: 9.8.2
* OS: MacOs 12.0.1

IBANs generated for pl_PL locales are 30 characters long. This is too many. Valid PL IBAN should have 28 characters (including country code).

### Steps to reproduce
Generate a Polish IBAN with:
```
from faker import Faker
  fake=Faker('pl-PL')
  print(fake.iban())
```
Copy paste generated string into IBAN Validator at https://www.ibancalculator.com/
### Expected behavior

IBAN should have the correct length and checksum

### Actual behavior

There is an error message that IBAN have too many characters:
"This IBAN cannot be correct because of its length. A Polish IBAN always contains exactly 28 digits and letters ("PL", a 2-digit checksum, and the 24-digit national account number, whose first 8 digits determine the bank and branch). The IBAN you entered is 30 characters long."


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `faker/providers/bank/pl_PL/__init__.py`
Content:
```
1 from .. import Provider as BankProvider
2 
3 
4 class Provider(BankProvider):
5     """Implement bank provider for ``pl_PL`` locale."""
6 
7     bban_format = "#" * 26
8     country_code = "PL"
9
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/faker/providers/bank/pl_PL/__init__.py b/faker/providers/bank/pl_PL/__init__.py
--- a/faker/providers/bank/pl_PL/__init__.py
+++ b/faker/providers/bank/pl_PL/__init__.py
@@ -4,5 +4,5 @@
 class Provider(BankProvider):
     """Implement bank provider for ``pl_PL`` locale."""
 
-    bban_format = "#" * 26
+    bban_format = "#" * 24
     country_code = "PL"

{"golden_diff": "diff --git a/faker/providers/bank/pl_PL/__init__.py b/faker/providers/bank/pl_PL/__init__.py\n--- a/faker/providers/bank/pl_PL/__init__.py\n+++ b/faker/providers/bank/pl_PL/__init__.py\n@@ -4,5 +4,5 @@\n class Provider(BankProvider):\n     \"\"\"Implement bank provider for ``pl_PL`` locale.\"\"\"\n \n-    bban_format = \"#\" * 26\n+    bban_format = \"#\" * 24\n     country_code = \"PL\"\n", "issue": "too long iban generated for pl-PL locale\n* Faker version: 9.8.2\r\n* OS: MacOs 12.0.1\r\n\r\nIBANs generated for pl_PL locales are 30 characters long. This is too many. Valid PL IBAN should have 28 characters (including country code).\r\n\r\n### Steps to reproduce\r\nGenerate a Polish IBAN with:\r\n```\r\nfrom faker import Faker\r\n  fake=Faker('pl-PL')\r\n  print(fake.iban())\r\n```\r\nCopy paste generated string into IBAN Validator at https://www.ibancalculator.com/\r\n### Expected behavior\r\n\r\nIBAN should have the correct length and checksum\r\n\r\n### Actual behavior\r\n\r\nThere is an error message that IBAN have too many characters:\r\n\"This IBAN cannot be correct because of its length. A Polish IBAN always contains exactly 28 digits and letters (\"PL\", a 2-digit checksum, and the 24-digit national account number, whose first 8 digits determine the bank and branch). The IBAN you entered is 30 characters long.\"\r\n\ntoo long iban generated for pl-PL locale\n* Faker version: 9.8.2\r\n* OS: MacOs 12.0.1\r\n\r\nIBANs generated for pl_PL locales are 30 characters long. This is too many. Valid PL IBAN should have 28 characters (including country code).\r\n\r\n### Steps to reproduce\r\nGenerate a Polish IBAN with:\r\n```\r\nfrom faker import Faker\r\n  fake=Faker('pl-PL')\r\n  print(fake.iban())\r\n```\r\nCopy paste generated string into IBAN Validator at https://www.ibancalculator.com/\r\n### Expected behavior\r\n\r\nIBAN should have the correct length and checksum\r\n\r\n### Actual behavior\r\n\r\nThere is an error message that IBAN have too many characters:\r\n\"This IBAN cannot be correct because of its length. A Polish IBAN always contains exactly 28 digits and letters (\"PL\", a 2-digit checksum, and the 24-digit national account number, whose first 8 digits determine the bank and branch). The IBAN you entered is 30 characters long.\"\r\n\n", "before_files": [{"content": "from .. import Provider as BankProvider\n\n\nclass Provider(BankProvider):\n    \"\"\"Implement bank provider for ``pl_PL`` locale.\"\"\"\n\n    bban_format = \"#\" * 26\n    country_code = \"PL\"\n", "path": "faker/providers/bank/pl_PL/__init__.py"}], "after_files": [{"content": "from .. import Provider as BankProvider\n\n\nclass Provider(BankProvider):\n    \"\"\"Implement bank provider for ``pl_PL`` locale.\"\"\"\n\n    bban_format = \"#\" * 24\n    country_code = \"PL\"\n", "path": "faker/providers/bank/pl_PL/__init__.py"}]}