Uncapped pmdarima and updated minimum version

[christopherbunn]

Resolves #3681

[codecov]

Codecov Report

Merging #4027 (b716999) into main (addf98a) will decrease coverage by 0.0%.
The diff coverage is n/a.

❗ Current head b716999 differs from pull request most recent head a275abe. Consider uploading reports for the commit a275abe to get more accurate results

@@           Coverage Diff           @@
##            main   #4027     +/-   ##
=======================================
- Coverage   99.7%   99.7%   -0.0%     
=======================================
  Files        349     347      -2     
  Lines      37200   36954    -246     
=======================================
- Hits       37079   36833    -246     
  Misses       121     121             

Impacted Files	Coverage Δ
evalml/tests/conftest.py	98.2% <0.0%> (-0.1%)	⬇️
evalml/tests/component_tests/test_components.py	99.0% <0.0%> (-<0.1%)	⬇️
evalml/utils/__init__.py	100.0% <0.0%> (ø)
evalml/objectives/objective_base.py	100.0% <0.0%> (ø)
evalml/pipelines/components/component_base.py	100.0% <0.0%> (ø)
evalml/tests/objective_tests/test_objectives.py	100.0% <0.0%> (ø)
...alml/objectives/binary_classification_objective.py	100.0% <0.0%> (ø)
evalml/utils/nullable_type_utils.py
...alml/tests/utils_tests/test_nullable_type_utils.py

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