Update infrastructure

[steven-murray]

Updates the instrastructure somewhat to keep things modern. Tests fail due to some parts of pspec not being up to date. I will go and fix those at some point....

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Codecov Report

❌ Patch coverage is 94.28571% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.11%. Comparing base (298f06b) to head (d864f77).
⚠️ Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pspec_likelihood/likelihood.py	92.68%	3 Missing ⚠️
...c/pspec_likelihood/arbitrary_linear_systematics.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   93.10%   94.11%   +1.01%     
==========================================
  Files           5        5              
  Lines         406      408       +2     
==========================================
+ Hits          378      384       +6     
+ Misses         28       24       -4     

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[steven-murray]

@adeliegorce though the warnings tests are failing, this is mostly due to hera_pspec, not pspec-likelihood. I have added some warnings tests over there (HERA-Team/hera_pspec#433) which should help us track these warnings over time, but they are just warnings, not true test failures.

[adeliegorce]

Thank you for all these changes @steven-murray! I just have two comments (see above). We should probably wait for hera_pspec PR #433 to be done before merging this one, to make sure the tests run OK.

[adeliegorce]

PR looks good; only small issue is the warning tests failing, mostly because of hera_pspec. This will need to be fixed in the future but is unrelated to this PR. PR approved.