Potential fix for code scanning alert no. 2: Workflow does not contain permissions

[DarkStarStrix]

Potential fix for https://github.com/DarkStarStrix/PyC/security/code-scanning/2

To fix the problem, explicitly set the permissions key in the workflow file to restrict the GITHUB_TOKEN to the minimum required privileges. Since the shown workflow only checks out code and runs build/test commands (and does not appear to require write access to the repository or PRs), the minimal permission of contents: read is sufficient. This should be added at the top level of the workflow file (just after the name: line and before on:), so it applies to all jobs unless overridden.

Steps:

• Edit .github/workflows/c-cpp.yml.
• Add the following block after the name: C/C++ CI line:

  permissions:
    contents: read

• No additional imports, methods, or definitions are needed.

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