CI: Update to actions/checkout@v4 and actions/upload-artifact@v4 and remove macOS 11 job #139
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There are warnings in GitHub Actions due to using actions/checkout@v2 and actions/upload-artifact@v2, which are deprecated. This PR updates them to actions/checkout@v4 and actions/upload-artifact@v4.
GitHub Actions has also deprecated their macOS 11 runner, so this PR removes it too.
Doing these things removes all the warnings.