DevOps Azure will not support macOS 10.14 as of December 10

[Vadim-Valdis Yudaev]

This day seems to have come.

See https://dev.azure.com/macports/macports-ports/_build/results?buildId=18866&view=logs&j=ca395085-040a-526b-2ce8-bdc85f692774

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##[warning]An image label with the label macOS-10.14 does not exist.
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> On Nov 25, 2021, at 04:52, Joshua Root <jmr at macports.org> wrote:
> 
> On 2021-11-25 12:31 , Vadim-Valdis Yudaev wrote:
>> Hi here,
>> Since that DevOps Azure will not support macOS 10.14 as of December 10, it's
>> worth considering bump the version to 10.15. Otherwise, we may get a broken
>> check again for PRs.
>>> The macOS-10.14 environment is deprecated and will be removed on December 10,
>>> 2021. For more details see
>>> https://devblogs.microsoft.com/devops/hosted-pipelines-image-deprecation/
> 
> We already have GitHub Actions for 10.15, so we might as well just drop Azure as of that date.
> 
> - Josh