Updates protobuf and flow-emulator versions

[UlyanaAndrukhiv]

Context

In this pull request:

• removed replace for protobuf and updated to last version
• removed replace for flow-emulator and updated to last version

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.41%. Comparing base (0b0592c) to head (4b8293b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5626      +/-   ##
==========================================
- Coverage   55.55%   55.41%   -0.14%     
==========================================
  Files        1043      975      -68     
  Lines      102034    96358    -5676     
==========================================
- Hits        56687    53400    -3287     
+ Misses      40995    38771    -2224     
+ Partials     4352     4187     -165     

Flag	Coverage Δ
unittests	55.41% <ø> (-0.14%)	⬇️

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