Sync our torchmetrics wrappers after the 0.4 release

[carmocca]

What does this PR do?

2 issues after the torchmetrics 0.4 release:

• is_multi{class,label} was removed. We can also remove it because we pin the torchmetrics version. The deprecation process was done in torchmetrics.
• The to_categorical argument was renamed.

Fixes the failing tests in master
There will be a separate fix for the bug-fix branch where we want to keep BC: #8206

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[Borda]

the fix is a double wrapper which is switched according to TM version
https://github.com/Borda/pyDeprecate#conditional-skip

[tchaton]

LGTM !

[codecov]

Codecov Report

Merging #8205 (14e9fdc) into master (9444a08) will decrease coverage by 0%.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #8205   +/-   ##
======================================
- Coverage      93%     92%   -0%     
======================================
  Files         212     212           
  Lines       13588   13588           
======================================
- Hits        12613   12559   -54     
- Misses        975    1029   +54     

[Borda]

probably unrelated failer on Windows minimal

>       if not torch_distrib.is_initialized():
E       AttributeError: module 'torch.distributed' has no attribute 'is_initialized'

[carmocca]

probably unrelated failer on Windows minimal

>       if not torch_distrib.is_initialized():
E       AttributeError: module 'torch.distributed' has no attribute 'is_initialized'

I have a fix for this in #8199, but needs this PR first