fix: update Xcode version

[ncooke3]

#no-changelog

[gemini-code-assist]

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[ncooke3]

One reusable workflow learning: the OS is determined by the calling workflow (caller), so this approach won't work. Resuable workflows shouldn't have a runs-on:.

Wrong: https://docs.github.com/en/actions/how-tos/reuse-automations/reuse-workflows

[ncooke3]

Continue in #15732