Update CI

[morcuended]

• Make GH actions work again by using miniconda setup action (see Use setup-miniconda in CI cta-lstchain#966)
• Minor linting complains
• Move package info to cfg instead of setup.py

[codecov]

Codecov Report

Merging #148 (2354227) into main (5bb7118) will increase coverage by 0.04%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##             main     #148      +/-   ##
==========================================
+ Coverage   81.95%   81.99%   +0.04%     
==========================================
  Files          51       50       -1     
  Lines        4822     4811      -11     
==========================================
- Hits         3952     3945       -7     
+ Misses        870      866       -4     

Impacted Files	Coverage Δ
osa/conftest.py	91.52% <ø> (ø)
osa/scripts/autocloser.py	59.06% <0.00%> (ø)
osa/scripts/closer.py	75.66% <ø> (-0.26%)	⬇️
osa/provenance/io.py	77.41% <100.00%> (ø)
osa/provenance/utils.py	96.36% <100.00%> (-0.19%)	⬇️
osa/scripts/tests/test_osa_scripts.py	98.77% <100.00%> (+0.03%)	⬆️
osa/utils/tests/test_utils.py	98.38% <0.00%> (+1.61%)	⬆️
osa/utils/utils.py	81.93% <0.00%> (+1.93%)	⬆️

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