feat: support Firebase 12

[luc122c]

Firebase 12.0.0 has just been released.

https://github.com/firebase/firebase-js-sdk/releases/tag/firebase%4012.0.0

I think the only notable change for this project is the new minimum Node version of 20.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.90%. Comparing base (174515e) to head (1fa41e7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1629   +/-   ##
=======================================
  Coverage   62.90%   62.90%           
=======================================
  Files          28       28           
  Lines        1903     1903           
  Branches      264      264           
=======================================
  Hits         1197     1197           
  Misses        706      706           

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[posva]

Thanks!