Bump firebase-functions sdk version to v4 rc.

[taeold]

Updates various CLI tests to use the latest firebase functions and firebase admin sdk.

[codecov-commenter]

Codecov Report

Base: 56.16% // Head: 56.25% // Increases project coverage by +0.09% :tada:

Coverage data is based on head (5218832) compared to base (b0637b9). Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5127      +/-   ##
==========================================
+ Coverage   56.16%   56.25%   +0.09%     
==========================================
  Files         308      308              
  Lines       20721    20721              
  Branches     4195     4195              
==========================================
+ Hits        11637    11657      +20     
+ Misses       8074     8054      -20     
  Partials     1010     1010              

Impacted Files	Coverage Δ
src/emulator/functionsEmulator.ts	7.14% <0.00%> (ø)
src/emulator/storage/rules/runtime.ts	23.35% <0.00%> (+11.97%)	:arrow_up:

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