[issue31355] Remove Travis CI macOS job: rely on buildbots

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

I'm willing to give it another go. Do you want to open a PR to turn it back on and see how the timing looks, Antoine?

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status: pending -> open

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31355>
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