[skip-changelog] Update protobuf deps

[alessio-perugini]

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• The PR has no duplicates (please search among the Pull Requests
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• The PR follows
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• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)
• configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

Updating some deps regarding protobuf:

• google.golang.org/protobuf/cmd/[email protected]
• google.golang.org/grpc/cmd/[email protected]
• github.com/bufbuild/buf/cmd/*@v1.20.0
• protoc to v23.2

go.mod deps:

• google.golang.org/grpc -> v1.55.0
• google.golang.org/protobuf -> v1.30.0

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change, and is titled accordingly?

Other information

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.05 🎉

Comparison is base (74dd907) 62.78% compared to head (24819f9) 62.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2196      +/-   ##
==========================================
+ Coverage   62.78%   62.83%   +0.05%     
==========================================
  Files         221      221              
  Lines       19463    19475      +12     
==========================================
+ Hits        12219    12237      +18     
+ Misses       6156     6153       -3     
+ Partials     1088     1085       -3     

Flag	Coverage Δ
unit	62.83% <ø> (+0.05%)	⬆️

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see 15 files with indirect coverage changes

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[cmaglie]