[feat] Add support for Python 3.10

[teojgo]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2443 (64cac6e) into master (a052afa) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 64cac6e differs from pull request most recent head 8f20a2b. Consider uploading reports for the commit 8f20a2b to get more accurate results

@@            Coverage Diff             @@
##           master    #2443      +/-   ##
==========================================
- Coverage   85.71%   85.70%   -0.02%     
==========================================
  Files          56       56              
  Lines       10525    10512      -13     
==========================================
- Hits         9022     9009      -13     
  Misses       1503     1503              

Impacted Files	Coverage Δ
reframe/core/runtime.py	89.41% <0.00%> (-0.48%)	⬇️
reframe/core/systems.py	88.15% <0.00%> (-0.21%)	⬇️
reframe/core/config.py	91.03% <0.00%> (-0.08%)	⬇️
reframe/frontend/executors/__init__.py	97.55% <0.00%> (+0.01%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8b82339...8f20a2b. Read the comment docs.