Fix ``sphinx`` installation in GitHub Actions (#953) · breathe-doc/breathe@1842470

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/upload-artifact@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The following actions uses Node.js version which is deprecated and will be forced to run on node20: actions/upload-artifact@v2. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

Cache paths are empty. Please check the previous logs and make sure that the python version is specified

The following artifacts were uploaded using a version of actions/upload-artifact that is scheduled for deprecation: "docs build artifacts". Please update your workflow to use v4 of the artifact actions. Learn more: https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

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