Fix FutureWarning raised in scipy.sparse.diags

[ffl096]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.39%. Comparing base (6d3a103) to head (cea5a18).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
toponetx/utils/normalization.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #524   +/-   ##
=======================================
  Coverage   94.39%   94.39%           
=======================================
  Files          45       45           
  Lines        4285     4285           
=======================================
  Hits         4045     4045           
  Misses        240      240           

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[Copilot]

Pull request overview

This PR fixes FutureWarning raised by scipy.sparse.diags by explicitly adding the dtype=None parameter to all calls in the normalization utilities. This warning was introduced in newer versions of scipy where the dtype parameter is becoming mandatory.

Changes:

• Added dtype=None parameter to all 7 scipy.sparse.diags() calls in toponetx/utils/normalization.py

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