Update dependency firebase-functions to v4.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
firebase-functions	4.5.0 -> 4.6.0

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Release Notes

firebase/firebase-functions (firebase-functions)

### [`v4.6.0`](https://togithub.com/firebase/firebase-functions/releases/tag/v4.6.0) [Compare Source](https://togithub.com/firebase/firebase-functions/compare/v4.5.0...v4.6.0) - Wrap 2nd gen onCall functions with trace context. ([#​1491](https://togithub.com/firebase/firebase-functions/issues/1491)) - Bump peer depdencies for firebase-admin to support 12.0.0. ([#​1509](https://togithub.com/firebase/firebase-functions/issues/1509))

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