Limit xMac JDK22+ testing to MacOS v11+

[adamfarley]

...because JDK22 and up are not built to be usable on MacOS versions under 11.

[github-actions]

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[adamfarley]

Fixes #949

[adamfarley]

Being tested here: https://ci.adoptium.net/job/build-scripts/job/jobs/job/jdk22/job/jdk22-mac-x64-temurin/18/console

[adamfarley]

Update, I re-tested a copy of this fix here, plus some debug code to prove it's definitely using our modified code.

https://ci.adoptium.net/job/build-scripts/job/openjdk22-pipeline/128/console

Note: The debug code is not included in this PR.

[adamfarley]

run tests