fix: Handle case where verifier Nonce func is nil

[ymarcus93]

The Nonce func in IDTokenVerifier can technically be set to nil. We don't want to panic by calling a nil func. So I've updated the VerifyIDToken func to skip the nonce claim check if the func is nil.

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[livio-a]

@ymarcus93 thank you for the fix.

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🎉 This PR is included in version 3.23.1 🎉

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