fix(deps): update dependency firebase-functions to ^4.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
firebase-functions	^4.8.0 -> ^4.8.1

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Release Notes

firebase/firebase-functions (firebase-functions)

### [`v4.8.1`](https://togithub.com/firebase/firebase-functions/releases/tag/v4.8.1) [Compare Source](https://togithub.com/firebase/firebase-functions/compare/v4.8.0...v4.8.1) Fix bug where 1st gen functions eventually fail with stack too deep ([#​1540](https://togithub.com/firebase/firebase-functions/issues/1540)) Make simple CORS options static for improved debugability ([#​1536](https://togithub.com/firebase/firebase-functions/issues/1536))

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