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Drop unsupported GitHub Actions runners
* GitHub Actions dropped suuport for macos-10.15 on 2022-12-01: actions/runner-images#6002 * GitHub Actions dropped suuport for ubuntu-18.04 on 2023-04-03: actions/runner-images#5583 Although there are benefits to testing EventMachine with these older OS versions—especially given EventMachine's legacy status and the types of projects which are most likely to depend on it—there are also significant costs to maintaining CI for them once GitHub Actions has dropped support.
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