Bump sympy in CI

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.77%. Comparing base (4c6efe8) to head (a4bfed2). Report is 3 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #493 +/- ## ========================================== - Coverage 78.03% 77.77% -0.27% ========================================== Files 17 17 Lines 4193 4193 ========================================== - Hits 3272 3261 -11 - Misses 921 932 +11 ```

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[utensil]

SymPy 1.9: powers with negative signs in the exponent are now printed in the denominator

which also changed the order.

[utensil]

SymPy 1.10: this is the version that changes the behaviors related to the negative signs as reported by #489 .

No corresponding change log can be confirmed after searching for "sign", "neg" etc.

Another issue in this version is reported as #494 .

[utensil]

SymPy 1.11:

• extra {} after begin{array} in the LaTeX, see b46762115cdf38c657557d1bc129953bd9eecd07 which is "Fixed a bug with Array printing" in the release note

• 495 which is introduced by "Function subclasses now raise an exception if the eval method is not defined as a @classmethod" in the release note.

[utensil]

SymPy 1.12: no extra hassle.

All CI green. The coverage drop is due to the temporary removal of gsym-printing.ipynb. Merging.