Deprecation Fix in spatial_smoothing.py

[Foxglove144]

Description

Replaced the import statement from scipy.ndimage.filters import median_filter with from scipy.ndimage import median_filter.

Fixes # (issue)

Type of change

Please check all relevant options.

• Improvement (non-breaking)
• Bug fix (non-breaking)
• New feature (non-breaking)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Testing

Please describe the tests that you ran to verify your changes. Consider listing any relevant details of your test configuration.

• Test A
• Test B

Test Configuration:

• OS
• Python version
• ART version or commit number
• TensorFlow / Keras / PyTorch / MXNet version

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

Merging #2211 (c2b35c0) into main (bc39091) will not change coverage.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##             main    #2211   +/-   ##
=======================================
  Coverage   85.62%   85.62%           
=======================================
  Files         308      308           
  Lines       27448    27448           
  Branches     5044     5044           
=======================================
  Hits        23502    23502           
  Misses       2667     2667           
  Partials     1279     1279           

Impacted Files	Coverage Δ
art/defences/preprocessor/spatial_smoothing.py	100.00% <100.00%> (ø)

[beat-buesser]

Hi @Foxglove144 Thank you very much for fixing this deprecation warning!