BF(TST): use older python 3.8 in testing nose utils

[yarikoptic]

New one 3.10 causes installation problems since likely simply no longer maintained/compatible. For the sake of it, fix it to test against 3.8 and in another PR against master we should deprecate/remove nose parts entirely

Closes #7259

[codecov]

Codecov Report

Base: 88.71% // Head: 90.70% // Increases project coverage by +1.98% 🎉

Coverage data is based on head (944c768) compared to base (d3662eb).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 944c768 differs from pull request most recent head 29ab45e. Consider uploading reports for the commit 29ab45e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            maint    #7260      +/-   ##
==========================================
+ Coverage   88.71%   90.70%   +1.98%     
==========================================
  Files         326      326              
  Lines       44420    44423       +3     
  Branches     5919     5919              
==========================================
+ Hits        39406    40292     +886     
+ Misses       4999     4116     -883     
  Partials       15       15              

Impacted Files	Coverage Δ
datalad/runner/runnerthreads.py	97.50% <100.00%> (+0.02%)	⬆️
datalad/utils.py	87.97% <100.00%> (+0.02%)	⬆️
datalad/support/tests/test_sshrun.py	98.27% <0.00%> (-1.73%)	⬇️
datalad/local/tests/test_add_archive_content.py	99.25% <0.00%> (-0.38%)	⬇️
datalad/distributed/ora_remote.py	79.52% <0.00%> (-0.28%)	⬇️
datalad/tests/test_utils.py	97.32% <0.00%> (-0.14%)	⬇️
datalad/tests/utils_pytest.py	89.08% <0.00%> (-0.11%)	⬇️
datalad/support/gitrepo.py	92.49% <0.00%> (-0.08%)	⬇️
datalad/_version.py	45.68% <0.00%> (ø)
datalad/support/annexrepo.py	90.43% <0.00%> (+0.08%)	⬆️
... and 7 more

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[yarikoptic]

overall -- seems to be working, so I will merge since the only relevant "Test old nose code / test (pull_request) " passed and I just added the changelog snippet.

[yarikoptic-gitmate]

PR released in 0.18.2