always reorder inputs when computing AUROC

[djdameln]

Description

• This PR mirrors the changes in add reorder=True argument in aupro #944 in the auroc metric. This was previously not possible, because PyTorch < 1.9 did not support stable sort, which would lead to unpredictable behaviour for duplicate values of fpr/tpr.

!! This means that Anomalib no longer supports PyTorch 1.8 and lower !!
(this should not be an issue because we have PL 1.7.0 in the requirements, which also requires 1.9 or higher)
More details here and here

Changes

• Bug fix (non-breaking change which fixes an issue)
• Refactor (non-breaking change which refactors the code base)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• My code follows the pre-commit style and check guidelines of this project.
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• 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 tests pass locally with my changes
• I have added a summary of my changes to the CHANGELOG (not for minor changes, docs and tests).

[ashwinvaidya17]

Thanks

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (c6bd757) 81.34% compared to head (714bbff) 81.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #945      +/-   ##
==========================================
- Coverage   81.34%   81.33%   -0.01%     
==========================================
  Files         176      176              
  Lines        6812     6809       -3     
==========================================
- Hits         5541     5538       -3     
  Misses       1271     1271              

Impacted Files	Coverage Δ
src/anomalib/utils/metrics/auroc.py	100.00% <100.00%> (ø)

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