chore(deps): update dependency firebase-functions to v6.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
firebase-functions	6.5.0 -> 6.6.0

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Release Notes

firebase/firebase-functions (firebase-functions)

v6.6.0

Compare Source

• Add defineJsonSecret API for storing structured JSON objects in Cloud Secret Manager. (#​1745)
• Enhance validation against incomplete/invalid app_remove events to avoid runtime crashes. (#​1738)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.92%. Comparing base (7f5dd65) to head (970dfd6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #10   +/-   ##
=======================================
  Coverage   87.92%   87.92%           
=======================================
  Files          14       14           
  Lines        1317     1317           
  Branches      294      294           
=======================================
  Hits         1158     1158           
  Misses        156      156           
  Partials        3        3           

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