Removed unused imports

[czgdp1807]

Fixes #15105
unused imports are removed from matrices.py to clean up the code in accordance with the issue mentioned above.

• matrices
  • unused imports are removed from matrices.py to clean up the code.

[sympy-bot]

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• matrices
  • unused imports are removed from matrices.py to clean up the code. (#15107 by @czgdp1807)

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Fixes #15105 
unused imports are removed from matrices.py to clean up the code in accordance with the issue mentioned above.

<!-- BEGIN RELEASE NOTES -->
* matrices
  * unused imports are removed from matrices.py to clean up the code.
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[smichr]

Thanks, it's in.