Removed adequacy warning catching and made alpha an MR parameter

[jmafoster1]

I removed the try...except block from the causal test adequacy loop as it was only catching warnings and was messing up some results.

I also added alpha as a parameter for MetamorphicRelation.to_json_stub as I wanted to change it.

I have also limited us to pandas 2.x for now, since pandas 3 changes some default behaviour that breaks the tests.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	32		0	0.96s
✅ PYTHON	pylint	32		0	6.06s

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.86%. Comparing base (4a3e9d7) to head (32fbf15).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #375      +/-   ##
==========================================
+ Coverage   97.29%   97.86%   +0.56%     
==========================================
  Files          27       27              
  Lines        1554     1544      -10     
==========================================
- Hits         1512     1511       -1     
+ Misses         42       33       -9     

Files with missing lines	Coverage Δ
causal_testing/testing/causal_test_adequacy.py	100.00% <100.00%> (+12.67%)	⬆️
causal_testing/testing/metamorphic_relation.py	100.00% <100.00%> (ø)

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