Bump protobuf dependency to make CI happy

[AlekSi]

Description

That functionality is not actually being used, but some of our tools are not smart enough about that.

Readiness checklist

• I added/updated unit tests (and they pass).
• I added/updated integration/compatibility tests (and they pass).
• I added/updated comments and checked rendering.
• I made spot refactorings.
• I updated user documentation.
• I ran task all, and it passed.
• I ensured that PR title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Milestone (Next), Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.72%. Comparing base (346fe7a) to head (57d1db1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4187      +/-   ##
==========================================
- Coverage   74.90%   73.72%   -1.18%     
==========================================
  Files         339      339              
  Lines       22786    22786              
==========================================
- Hits        17068    16800     -268     
- Misses       4419     4698     +279     
+ Partials     1299     1288      -11     

see 32 files with indirect coverage changes

Flag	Coverage Δ
filter-false	?
filter-true	67.08% <ø> (-1.65%)	⬇️
hana-1	?
integration	67.08% <ø> (-1.69%)	⬇️
mongodb-1	4.88% <ø> (ø)
mysql-1	?
mysql-2	?
mysql-3	?
postgresql-1	46.60% <ø> (-0.07%)	⬇️
postgresql-2	?
postgresql-3	49.30% <ø> (-0.12%)	⬇️
sqlite-1	45.78% <ø> (-0.05%)	⬇️
sqlite-2	48.61% <ø> (-0.09%)	⬇️
sqlite-3	48.54% <ø> (-0.05%)	⬇️
unit	32.54% <ø> (ø)

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