Reduce CMake CI matrix to active GitHub-hosted runner images

[Copilot]

PR #32 was reported as having failing Actions, but the underlying issue was not a test regression. The CMake workflow was carrying legacy matrix entries that were being cancelled on macos-13 and windows-2019, which made the run status noisy and misleading.

• Root cause

  • The CMake workflow matrix included runner images that were not completing reliably:
    • macos-13
    • windows-2019
  • The remaining matrix jobs were already completing successfully, so the issue was in CI orchestration rather than the SimHash change itself.

• Workflow change

  • Trimmed the OS matrix in .github/workflows/cmake.yml to keep only the actively passing runner set:
    • ubuntu-22.04
    • ubuntu-24.04
    • macos-14
    • windows-2022

• Effect

  • Removes the cancelled legacy runner jobs from the workflow result.
  • Preserves cross-platform coverage across Linux, macOS, and Windows without changing build or test logic.

strategy:
  matrix:
    os:
      - ubuntu-22.04
      - ubuntu-24.04
      - macos-14
      - windows-2022

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