fix(deps): update dependency firebase-functions to ^5.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
firebase-functions	^5.1.0 -> ^5.1.1

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Release Notes

firebase/firebase-functions (firebase-functions)

### [`v5.1.1`](https://redirect.github.com/firebase/firebase-functions/releases/tag/v5.1.1) [Compare Source](https://redirect.github.com/firebase/firebase-functions/compare/v5.1.0...v5.1.1) - Fix retry in event triggered functions. ([#​1463](https://redirect.github.com/firebase/firebase-functions/issues/1463)) - Expose retry configuration in v2 RTDB trigger ([#​1588](https://redirect.github.com/firebase/firebase-functions/issues/1588)) - Fix CORS options for v2 callable functions ([#​1564](https://redirect.github.com/firebase/firebase-functions/issues/1564)) - Remove invalid `enforceAppCheck` option for v2 onRequest trigger ([#​1477](https://redirect.github.com/firebase/firebase-functions/issues/1477))

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