Update dependency firebase-functions to v5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
firebase-functions	4.9.0 -> 5.0.1

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Release Notes

firebase/firebase-functions (firebase-functions)

### [`v5.0.1`](https://togithub.com/firebase/firebase-functions/releases/tag/v5.0.1) [Compare Source](https://togithub.com/firebase/firebase-functions/compare/v5.0.0...v5.0.1) - Fix App fetching for named firestore instances ([#​1562](https://togithub.com/firebase/firebase-functions/issues/1562)). ### [`v5.0.0`](https://togithub.com/firebase/firebase-functions/releases/tag/v5.0.0) [Compare Source](https://togithub.com/firebase/firebase-functions/compare/v4.9.0...v5.0.0) - Add option to get named firestore instance for v2 firestore functions ([#​1550](https://togithub.com/firebase/firebase-functions/issues/1550)). - Remove firebase-admin v10 dependency for Firestore triggers multi-DB support ([#​1555](https://togithub.com/firebase/firebase-functions/issues/1555)).

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