Remove Python 3.7

[schlenk]

• Any changes relevant to users are recorded in the CHANGELOG.md.
• The documentation has been updated, if necessary.
• New code is annotated.
• Changes are covered by tests.

---

• Removed Python 3.7 Build as required build from Branch Protection
• Fixed readthedocs configuration
• Updated Versions in CI config and setup

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.80%. Comparing base (0e30cd2) to head (f0e8046).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #870      +/-   ##
==========================================
- Coverage   63.83%   63.80%   -0.04%     
==========================================
  Files          64       64              
  Lines       11879    11879              
  Branches     2107     2155      +48     
==========================================
- Hits         7583     7579       -4     
- Misses       3693     3697       +4     
  Partials      603      603              

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