Update default version of protoc to 3.7.1

[bufdev]

No description provided.

[codecov-io]

Codecov Report

Merging #417 into dev will decrease coverage by 0.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #417      +/-   ##
==========================================
- Coverage   73.49%   73.17%   -0.32%     
==========================================
  Files         137      133       -4     
  Lines        6398     6342      -56     
==========================================
- Hits         4702     4641      -61     
- Misses       1218     1220       +2     
- Partials      478      481       +3

Impacted Files	Coverage Δ
...sentence_comments_except_request_response_types.go	85.71% <0%> (-8.58%)	⬇️
internal/lint/lint.go	71.85% <0%> (-1.49%)	⬇️
internal/lint/check_enum_fields_have_comments.go
...int/check_message_fields_have_sentence_comments.go
...nternal/lint/check_message_fields_have_comments.go
...l/lint/check_enum_fields_have_sentence_comments.go

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