Fixing some general issues, including deprecation warnings

[JesusTorrado]

Fixing random stuff that has come up in some issues and cosmo coffee topics, as well as deprecation warnings after updating my laptop to Python 3.11 and the latest versions of some libs.

A particularly annoying is this one: numpy/numpy#10615. Not sure if we will be able to catch all occurrences before it actually fails.

[codecov-commenter]

Codecov Report

Merging #313 (98bc8aa) into master (ae2e566) will decrease coverage by 0.07%.
Report is 1 commits behind head on master.
The diff coverage is 70.83%.

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@@            Coverage Diff             @@
##           master     #313      +/-   ##
==========================================
- Coverage   84.78%   84.71%   -0.07%     
==========================================
  Files         122      122              
  Lines        8945     8971      +26     
==========================================
+ Hits         7584     7600      +16     
- Misses       1361     1371      +10     

Files Changed	Coverage Δ
cobaya/output.py	87.36% <ø> (ø)
cobaya/theories/cosmo/boltzmannbase.py	90.98% <ø> (ø)
cobaya/theories/classy/classy.py	76.11% <40.00%> (-1.78%)	⬇️
cobaya/model.py	94.41% <75.00%> (ø)
cobaya/likelihood.py	93.33% <88.88%> (+0.22%)	⬆️
cobaya/component.py	92.02% <100.00%> (+0.14%)	⬆️
cobaya/install.py	81.02% <100.00%> (-0.33%)	⬇️
cobaya/likelihoods/base_classes/bao.py	96.52% <100.00%> (ø)