Fix linter violations

[tomas-kral]

Description

This PR should fix outstanding linter violations that crept in in the recently merged branch.

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.90%. Comparing base (149cf2f) to head (418b8d2).

Files with missing lines	Patch %	Lines
eccodes/highlevel/_bufr/common.py	0.00%	7 Missing ⚠️
eccodes/highlevel/_bufr/tables.py	0.00%	5 Missing ⚠️
eccodes/highlevel/_bufr/coder.py	0.00%	3 Missing ⚠️
eccodes/highlevel/_bufr/tree.py	0.00%	2 Missing ⚠️
eccodes/highlevel/_bufr/__init__.py	0.00%	1 Missing ⚠️
eccodes/highlevel/_bufr/data.py	0.00%	1 Missing ⚠️
eccodes/highlevel/message.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #138      +/-   ##
===========================================
+ Coverage    29.89%   29.90%   +0.01%     
===========================================
  Files           34       34              
  Lines         6149     6146       -3     
  Branches       735      735              
===========================================
  Hits          1838     1838              
+ Misses        4288     4285       -3     
  Partials        23       23              

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