Improve deletion of timer

[marvinfriede]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 55.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 82.65%. Comparing base (a1e87b0) to head (c2b052e).

Files with missing lines	Patch %	Lines
src/dxtb/_src/timing/timer.py	52.63%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #176      +/-   ##
==========================================
- Coverage   82.72%   82.65%   -0.07%     
==========================================
  Files         195      195              
  Lines        9717     9732      +15     
  Branches     1473     1475       +2     
==========================================
+ Hits         8038     8044       +6     
- Misses       1328     1337       +9     
  Partials      351      351              

Flag	Coverage Δ
	82.65% <55.00%> (-0.07%)	⬇️

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