Potential fix for code scanning alert no. 76: Workflow does not contain permissions

[David-Engel]

Potential fix for https://github.com/microsoft/msphpsql/security/code-scanning/76

Add an explicit permissions block in .github/workflows/cpp-lint.yml at the workflow root so it applies to all jobs (including cppcheck).
For this workflow, the minimal required permission is:

• contents: read

This preserves existing functionality (checkout + linting) while enforcing least privilege and satisfying the CodeQL finding.

Suggested fixes powered by Copilot Autofix. Review carefully before merging.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.72%. Comparing base (f17b007) to head (e4012c8).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1648   +/-   ##
=======================================
  Coverage   85.72%   85.72%           
=======================================
  Files          23       23           
  Lines        7210     7210           
=======================================
  Hits         6181     6181           
  Misses       1029     1029           

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