Restore pod Firebase/Firestore for tvOS

[paulb777]

Restore after accidental removal in #15015

[gemini-code-assist]

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[paulb777]

/gemini review

[gemini-code-assist]

Code Review

This pull request restores tvOS support for the Firebase/Firestore pod, which was accidentally removed. The changes involve correcting a deployment target in Firebase.podspec and adding a corresponding entry to the Firestore/CHANGELOG.md.