chore(deps): update devdependency firebase-functions to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
firebase-functions	^4.9.0 -> ^6.0.1

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Release Notes

firebase/firebase-functions (firebase-functions)

v6.0.1

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• Fix bug where v1 functions can't be emulated (#​1615)

v6.0.0

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

v5.1.1

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• Fix retry in event triggered functions. (#​1463)
• Expose retry configuration in v2 RTDB trigger (#​1588)
• Fix CORS options for v2 callable functions (#​1564)
• Remove invalid enforceAppCheck option for v2 onRequest trigger (#​1477)

v5.1.0

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• Future Extensions support (#​1590)

v5.0.1

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• Fix App fetching for named firestore instances (#​1562).

v5.0.0

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• Add option to get named firestore instance for v2 firestore functions (#​1550).
• Remove firebase-admin v10 dependency for Firestore triggers multi-DB support (#​1555).

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