chore(github): simplify the CODEOWNERS file

[orhun]

Auto review-requests were not working so let's try this way.

[codecov]

Codecov Report

Merging #271 (4f41f0f) into main (130bdf8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #271   +/-   ##
=======================================
  Coverage   82.38%   82.38%           
=======================================
  Files          35       35           
  Lines        7197     7197           
=======================================
  Hits         5929     5929           
  Misses       1268     1268           

[joshka]

Ha yep:
https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners#codeowners-syntax

If you want to match two or more code owners with the same pattern, all the code owners must be on the same line. If the code owners are not on the same line, the pattern matches only the last mentioned code owner.