DOC: Fix rst backticks to make CI green

[Jacob-Stevens-Haas]

Solves the CI error:

sphinx.errors.SphinxWarning: /home/runner/work/pysindy/pysindy/pysindy/optimizers/miosr.py:docstring of pysindy.optimizers.miosr.MIOSR:12:'any' reference target not found: model

[Jacob-Stevens-Haas]

tl;dr: it was a concurrent merge issue with the MIOSR work that used rst backticks incorrectly in a docstring. Along the way, one of the dependencies for the flake8 version used in pre-commit upgraded to be incompatible with that version of flake8, so I bumped the flake8 pre-commit version.

[codecov-commenter]

Codecov Report

Base: 92.92% // Head: 92.94% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (47289dc) compared to base (02c3d05).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #254      +/-   ##
==========================================
+ Coverage   92.92%   92.94%   +0.01%     
==========================================
  Files          35       34       -1     
  Lines        3507     3458      -49     
==========================================
- Hits         3259     3214      -45     
+ Misses        248      244       -4     

Impacted Files	Coverage Δ
...indy/differentiation/smoothed_finite_difference.py	100.00% <ø> (ø)
pysindy/feature_library/weak_pde_library.py	95.11% <ø> (ø)
pysindy/optimizers/miosr.py	76.40% <ø> (ø)
pysindy/pysindy.py	95.03% <ø> (ø)
pysindy/utils/axes.py	95.45% <ø> (ø)
pysindy/utils/base.py	83.73% <ø> (ø)
pysindy/optimizers/base.py	92.24% <100.00%> (-0.06%)	⬇️
pysindy/__init__.py

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