Swap macos-13 with macos-15-intel GHA runner in CI

[anoadragon453]

Fixes #18994.

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[reivilibre]

(Will the wheels on MacOS 14 arm64 work on MacOS 15 arm64?)

[anoadragon453]

@reivilibre that config has not changed. But I expect so, given no one has complained about it, and typically software built for older MacOS versions will run on newer versions.