[Infra] For SPM, defer to Xcode for supported platform versions

[ncooke3]

SPM successor to #15015

Fixes #14732

#no-changelog

[gemini-code-assist]

Using Gemini Code Assist

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Invoking Gemini

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Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in issue comments and review comments.
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Customization

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[ncooke3]

Firestore test failure looks like a flake. Will see what run #2 reveals.

[andrewheard]

LGTM. I was going to suggest bumping watchOS to 8.0 to align with iOS 15 but I see they're still showing 7.0 as the minimum deployment target here: https://developer.apple.com/support/xcode/