chore(deps-dev): update pylint requirement from 4.0.8 to 4.0.9

[dependabot]

Updates the requirements on pylint to permit the latest version.

Release notes

Sourced from pylint's releases.

v4.0.9

What's new in Pylint 4.0.9?

Release date: 2026-09-23

Security Fixes

• Someone without access to the configuration or linted code, but with access to the cache directory (predictable PYLINT_HOME on a multi-user host) can no longer write a crafted pickle that will runs arbitrary code when pylint access its stat cache. The result cache is now stored as JSON instead of pickle, preventing code-execution. The workaround is upgrading or not pointing PYLINT_HOME to an untrusted, shared, or group-writable directory. The default value, ~/.cache/pylint, is writable only by the user running pylint. (CVE with the same information pending)

False Positives Fixed

• Fixed a false positive for no-self-use on a method that only uses self before a locally defined class (or other nested method), because the checker's could-be-a-function tracking state was not restored after visiting the nested method.

  Closes #3705

• Fix a false positive for :ref:not-callable when calling functions constructed with types.FunctionType or types.LambdaType.

  Closes #7500

• Fix a false positive for unnecessary-direct-lambda-call when a directly called lambda in a class body wraps a comprehension containing an assignment expression. PEP 572 makes that a SyntaxError without the lambda's scope, so following the message produced code that would not compile.

  Closes #9294

• Fix a false positive for :ref:unnecessary-ellipsis when an ellipsis is the sole body statement of a method defined on a Protocol.

  Closes #9319

• Fix a false positive for :ref:bad-exception-cause when the bases of the class being raised from cannot be inferred, such as an exception deriving from a C extension class. :ref:raising-non-exception and :ref:catching-non-exception already guard the same inherit_from_std_ex

... (truncated)

Commits

• 303703f Bump pylint to 4.0.9, update changelog (#11448)
• b342384 Fix block-scoped disable leaking into sibling elif/else blocks (#11429) (#11445)
• 58c87cf Store the results cache as JSON instead of pickle
• e3f4942 [Backport maintenance/4.0.x] Fix crash on failed attribute inference (#11443)
• faf47f9 [Backport maintenance/4.0.x] Fix false positive no-self-use when a method con...
• 20c7bb9 [Backport maintenance/4.0.x] Fix a crash in method-hidden for methods named a...
• 47e6757 [Backport maintenance/4.0.x] Fix bad-exception-cause false positive when the ...
• ae3ee53 [Backport maintenance/4.0.x] Fix not-callable false positive for types.Functi...
• 3e444be [Backport maintenance/4.0.x] Fix a crash in unnecessary-default-type-args for...
• 8f2dd4f [Backport maintenance/4.0.x] Fix declare-non-slot false positives for ClassVa...
• Additional commits viewable in compare view

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Coverage ∅ diff coverage · +0.00% coverage variation

Metric	Results
Coverage variation	✅ +0.00% coverage variation
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (7c6aead)	559	559	100.00%
Head commit (1d3011b)	559 (+0)	559 (+0)	100.00% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#830)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7c6aead) to head (1d3011b).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #830   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          559       559           
  Branches        41        41           
=========================================
  Hits           559       559           

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[vil02]

@dependabot rebase

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud