Update min Pytorch to 1.10

[SkafteNicki]

What does this PR do?

Updates minimum pytorch from 1.8 to 1.10.
Version 1.10 was released on Oct 21, 2021, meaning that we will still be supporting a version close to 2 years old with this update. For reference, version 1.8 was released on Mar 4, 2021.

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

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📚 Documentation preview 📚: https://torchmetrics--2145.org.readthedocs.build/en/2145/

[Borda]

let's first add 2.1 in #2142

[codecov]

Codecov Report

Merging #2145 (2ec1959) into master (5c6b23c) will decrease coverage by 0%.
Report is 2 commits behind head on master.
The diff coverage is 71%.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #2145   +/-   ##
======================================
- Coverage      87%     87%   -0%     
======================================
  Files         293     293           
  Lines       16430   16410   -20     
======================================
- Hits        14286   14256   -30     
- Misses       2144    2154   +10