fix(ci): run lint only on Python 3.12, not 3.13/3.14

pylama 8.4.1 and its linters (pydocstyle, typed_ast) predate Python 3.13/3.14
and can't parse their AST; typed_ast won't compile on 3.12+ either. Lint is
version-independent static analysis, so run it once on the oldest matrix
version. Tests continue to run on 3.12/3.13/3.14.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: KrishnaSuravarapu

.github/workflows/unit-tests.yml

@@ -25,6 +25,10 @@ jobs:
       run: |
         pip install -r Access/access_modules/requirements.txt --no-cache-dir --ignore-installed
     - name: Lint code base
+      # pylama 8.4.1 and its linters (pydocstyle/typed_ast) predate Python 3.13+
+      # and can't parse their AST. Lint is version-independent, so run it once on
+      # the oldest matrix version; tests still run on every version.
+      if: matrix.python-version == '3.12'
       run: |
         pip install "setuptools<81"
         python -m pylama Access/accessrequest_helper.py scripts bootprocess