Add clang 14 to test suite

[Spacetown]

Since XCode has updated from clang-13 to clang-14 I need to add this version to our test suite to be able to test faster.

[codecov]

Codecov Report

Base: 95.57% // Head: 95.59% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (f827099) compared to base (ea2f842).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #731      +/-   ##
==========================================
+ Coverage   95.57%   95.59%   +0.01%     
==========================================
  Files          28       28              
  Lines        3845     3855      +10     
  Branches      671      672       +1     
==========================================
+ Hits         3675     3685      +10     
  Misses         92       92              
  Partials       78       78              

Flag	Coverage Δ
ubuntu-20.04	94.28% <ø> (+0.01%)	⬆️
windows-2019	95.18% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
gcovr/tests/test_gcovr.py	97.64% <ø> (ø)
gcovr/configuration.py	99.69% <0.00%> (+<0.01%)	⬆️

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[latk]

lgtm. Not 100% sure about the changes to the Dockerfile, but I think the chown had become superfluous anyway.

[Spacetown]

gtm. Not 100% sure about the changes to the Dockerfile, but I think the chown had become superfluous anyway.

Yes, it's not needed anymore because we don't generate a artifact anymore. Also the upload can be removed. The option to create the diff.zip was removed with the switch to nox in #516.