Add stacklevel to warnings

[jcapriot]

Fix B028 flake warning

[codecov]

Codecov Report

Merging #309 (b006390) into main (90f8482) will not change coverage.
The diff coverage is 20.00%.

@@           Coverage Diff           @@
##             main     #309   +/-   ##
=======================================
  Coverage   85.22%   85.22%           
=======================================
  Files          38       38           
  Lines       11283    11283           
=======================================
  Hits         9616     9616           
  Misses       1667     1667           

Impacted Files	Coverage Δ
discretize/base/base_mesh.py	93.01% <ø> (ø)
discretize/base/base_regular_mesh.py	84.29% <ø> (ø)
discretize/base/base_tensor_mesh.py	88.18% <ø> (ø)
discretize/cylindrical_mesh.py	94.14% <ø> (ø)
discretize/mixins/mesh_io.py	90.87% <ø> (ø)
discretize/mixins/mpl_mod.py	72.50% <0.00%> (ø)
discretize/mixins/vtk_mod.py	87.85% <ø> (ø)
discretize/operators/differential_operators.py	80.96% <0.00%> (ø)
discretize/operators/inner_products.py	93.28% <ø> (ø)
discretize/tree_mesh.py	70.71% <ø> (ø)
... and 10 more

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