exclude some lines from coverage

[akeeman]

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

I noticed that a test fails in #333 due to a coverage delta being too negative. It is induced by if TYPE_CHECKING: blocks, which should be ok.
This PR suggests some lines of code that may be excluded from coverage, as they generally are not ment to. It's a subset of what's suggested to be a good default by the covdefaults library.

[codecov]

Codecov Report

Merging #338 (dd960f9) into main (2f39fb5) will increase coverage by 4.1%.
The diff coverage is n/a.

❗ Current head dd960f9 differs from pull request most recent head d8c67e5. Consider uploading reports for the commit d8c67e5 to get more accurate results

@@           Coverage Diff           @@
##            main    #338     +/-   ##
=======================================
+ Coverage   91.8%   95.9%   +4.1%     
=======================================
  Files         29      29             
  Lines        955     914     -41     
  Branches     201     185     -16     
=======================================
  Hits         877     877             
+ Misses        50      24     -26     
+ Partials      28      13     -15     

see 15 files with indirect coverage changes

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[mkniewallner]

Thanks!