[INFRA] Update Sanitizer CI

[eseiler]

• Add -Wno-maybe-unitialized to gcc (bogus warnings)
• Do not check for implicit conversions in UBSan (seqan2 does a lot of implicit conversions from unsigned to signed int and vice versa)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.61%. Comparing base (4f355cb) to head (861445f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #165   +/-   ##
=======================================
  Coverage   76.61%   76.61%           
=======================================
  Files          74       74           
  Lines        3768     3768           
  Branches      487      487           
=======================================
  Hits         2887     2887           
  Misses        881      881           

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