build: update dependency firebase-functions to v6

[angular-robot]

This PR contains the following updates:

Package	Type	Update	Change
firebase-functions	devDependencies	major	^5.0.0 -> ^6.0.0

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Release Notes

firebase/firebase-functions (firebase-functions)

v6.0.0

Compare Source

• Breaking: Change default entrypoint of the firebase-functions package to v2 instead of v1 (#​1594)
• Add @​deprecated annotation on functions.config() API (#​1604)

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