fix(ci): align lint runner with Python 3.11 target

[chrislyonsKY]

Summary

• run the lint job on Python 3.11, matching AbovePy's minimum supported version and the configured mypy target
• prevent Python 3.12-only NumPy 2.5 stubs from being loaded while type-checking Python 3.11 compatibility

Fixes the lint failure in scheduled CI run #241.

Verification

• ruff check src/ tests/
• ruff format --check src/ tests/
• mypy --strict src/abovepy/ — success, 33 source files

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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