Fix issues pyright raises on newer Python versions

[Baschdl]

Pyright raised errors in newer Python versions (e.g. 3.10) which it didn't do in our CI pipeline running on 3.8. First step towards #1102

Checklist

• I agree with re-licensing my contribution from AGPLv3 to Apache-2.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.83%. Comparing base (4c2f71e) to head (cb5663c).
Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1108      +/-   ##
==========================================
+ Coverage   76.37%   76.83%   +0.45%     
==========================================
  Files          84       91       +7     
  Lines        6507     6588      +81     
==========================================
+ Hits         4970     5062      +92     
+ Misses       1537     1526      -11     

Flag	Coverage Δ
unittests	76.83% <100.00%> (+0.45%)	⬆️

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[manuelgloeckler]

I don't know how this fixes the issue, but I will approve it so that you can merge it in your branch.