chore: group packages that need to be updated together

[pichlermarc]

Which problem is this PR solving?

typedoc* and @protobuf-ts packages often have to be updated together. This PR

• groups typedoc and plugins
• groups @protobuf-ts since there's no monorepo definition included for it in renovate
• adds npm dedupe as a postinstall step so that our package-lock.json does not get too out of control.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.06%. Comparing base (90ad17b) to head (264c518).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5896   +/-   ##
=======================================
  Coverage   95.06%   95.06%           
=======================================
  Files         307      307           
  Lines        8031     8031           
  Branches     1627     1627           
=======================================
  Hits         7635     7635           
  Misses        396      396           

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