Simplify CodeQL workflow by removing unused settings

[nunoplopes]

Removed concurrency settings and Rust setup from CodeQL workflow.

[Copilot]

Pull request overview

This PR simplifies the repository’s CodeQL GitHub Actions workflow by removing job-level settings/steps, aiming to reduce configuration and setup overhead in .github/workflows/codeql.yml.

Changes:

• Removed workflow concurrency configuration (cancels in-progress runs for the same ref).
• Removed the Rust toolchain setup step from the CodeQL workflow.

Comments suppressed due to low confidence (1)

.github/workflows/codeql.yml:36

• The workflow matrix still includes rust and later runs cargo build, but the Rust toolchain setup step was removed. This makes the job rely on whatever Rust happens to be preinstalled on ubuntu-latest, which can cause CI failures or non-deterministic analysis if the runner image changes. Either restore an explicit Rust toolchain setup (recommended), or remove rust from the matrix and the Rust build step.

    - name: Initialize CodeQL
      uses: github/codeql-action/init@v4
      with:
        languages: ${{ matrix.language }}

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