Python 3.7 EOL

[chayim]

Pull Request check-list

Please make sure to review and check all of these items:

• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Description of change

Please provide a description of the change here.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 ⚠️

Comparison is base (2732a85) 90.65% compared to head (265f608) 90.63%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2852      +/-   ##
==========================================
- Coverage   90.65%   90.63%   -0.03%     
==========================================
  Files         126      126              
  Lines       32229    32229              
==========================================
- Hits        29217    29210       -7     
- Misses       3012     3019       +7     

see 4 files with indirect coverage changes

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[chayim]

closes #2824