Make is-zero-checks compatible with the upcoming sympy>1.12

[dweindl]

Current sympy master (tested: 0ededfcfc033ddca2d1d54a0eda85bf53c63761c):

IPython console for SymPy 1.13.dev (Python 3.12.2-64-bit) (ground types: python)
In [1]: Float(0) == 0
Out[1]: False
In [2]: Float(0).is_zero
Out[2]: True

vs 1.12:

Python console for SymPy 1.12 (Python 3.12.2-64-bit) (ground types: python)
>>> Float(0) == 0
True
>>> Float(0).is_zero
True

Therefore, replace == 0 by .is_zero.

Amongst other potential issues, this fixes zeros in sparse matrices. Closes #2320.

[codecov[bot]]

Codecov Report

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

Project coverage is 77.94%. Comparing base (2235ab7) to head (d3e069e).

Additional details and impacted files

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