fix(deps): update dependency firebase-functions to v4.9.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
firebase-functions	4.5.0 → 4.9.0

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Release Notes

firebase/firebase-functions (firebase-functions)

v4.9.0

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• Add new 2nd gen Firestore auth context triggers. (#​1519)

v4.8.2

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Fix bug with CORS options for an array of one string (#​1544)

v4.8.1

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Fix bug where 1st gen functions eventually fail with stack too deep (#​1540)
Make simple CORS options static for improved debugability (#​1536)

v4.8.0

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Add onInit callback function for global variable initialization (#​1531)

v4.7.0

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• Fixes access on deeply nested, nonexistent property. (#​1432)
• Add IteratedDataSnapshot interface to match with firebase admin v12 (#​1517).
• Make bucket parameterizeable in storage functions (#​1518)
• Introduce helper library for select and multi-select input (#​1518)

v4.6.0

Compare Source

• Wrap 2nd gen onCall functions with trace context. (#​1491)
• Bump peer depdencies for firebase-admin to support 12.0.0. (#​1509)

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