Fix CI compatibility with TM 0.8

[ethanwharris]

What does this PR do?

TM 0.8 is not compatible with old versions of PL (pre 1.5). Some of our requirements pin versions of PL so we need to also pin torchmetrics in these cases.

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[codecov]

Codecov Report

Merging #1296 (ab4ff91) into master (4aeffce) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1296   +/-   ##
=======================================
  Coverage   91.71%   91.71%           
=======================================
  Files         285      285           
  Lines       12815    12815           
=======================================
  Hits        11753    11753           
  Misses       1062     1062           

Flag	Coverage Δ
unittests	91.71% <ø> (ø)

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[Borda]

doing the same all day today in Lightning-AI/tutorials#158
the problem is that the latest release of pytorch-tabular=0.7.0 still requires PL 1.3.6 even though on master it is already updated so would be great to have new release 🐰