Improve code quality

[marvinfriede]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.34%. Comparing base (babd4aa) to head (7737c03).

Files	Patch %	Lines
src/dxtb/_src/calculators/types/analytical.py	50.00%	0 Missing and 1 partial ⚠️
...c/dxtb/_src/integral/driver/libcint/base_driver.py	0.00%	1 Missing ⚠️
src/dxtb/_src/integral/wrappers.py	0.00%	1 Missing ⚠️
src/dxtb/_src/io/handler.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
+ Coverage   81.32%   81.34%   +0.02%     
==========================================
  Files         189      189              
  Lines        9562     9538      -24     
  Branches     1423     1424       +1     
==========================================
- Hits         7776     7759      -17     
+ Misses       1418     1413       -5     
+ Partials      368      366       -2     

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