RFR: 8290000: Bump macOS GitHub actions to macOS 11 [v4]

[George Adams]

On Mon, 18 Jul 2022 12:56:14 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> George Adams has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
>> 
>>   switch to macos-11 as 12 doesn't have toolchain
>
> Looks fine to me. XCode 11.7 is listed as the lowest version supported by macos-11 image.

Thanks for the review @shipilev! Are you willing to sponsor?

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PR: https://git.openjdk.org/jdk/pull/9426