Updating tests, and comments in source files

[AakashGfude]

Updating latex regression files for sphinx 4.5. Updating mypy version and black version. Updated mypy needs additional configuration, and refactoring of ignore comments in source files.

[codecov[bot]]

Codecov Report

Merging #96 (dae6c9d) into master (a8b68ea) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #96   +/-   ##
=======================================
  Coverage   93.05%   93.05%           
=======================================
  Files           4        4           
  Lines         360      360           
=======================================
  Hits          335      335           
  Misses         25       25           

Flag	Coverage Δ
pytests	93.05% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sphinx_jupyterbook_latex/events.py	88.46% <100.00%> (ø)
sphinx_jupyterbook_latex/transforms.py	92.20% <100.00%> (ø)