Remove support for deprecated macos-10.15 and ubuntu-18.04 images

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eregon released this 27 Feb 19:10

· 265 commits to master since this release

92aece5

Both are deprecated and had brownout periods, so it's no longer possible to reliably build on those platforms with GH runners.
#467
actions/runner-images#5583
actions/runner-images#6002

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