Remove py37 support removal warning

[rwedge]

Remove warning triggered when importing featuretools in a py37 environment, which is no longer supported

[codecov]

Codecov Report

Merging #2186 (a98c71a) into main (33564e6) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2186      +/-   ##
==========================================
- Coverage   99.25%   99.25%   -0.01%     
==========================================
  Files         143      143              
  Lines       17508    17499       -9     
==========================================
- Hits        17378    17368      -10     
- Misses        130      131       +1     

Impacted Files	Coverage Δ
featuretools/__init__.py	72.09% <ø> (+0.98%)	⬆️
featuretools/synthesis/deep_feature_synthesis.py	99.07% <0.00%> (-0.47%)	⬇️

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