DM-36174: Require Python 3.10.

[TallJimbo]

daf_butler will soon require 3.10, even if code directly in pipe_base does not yet.

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Base: 82.08% // Head: 82.01% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (e6b8220) compared to base (646899f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
- Coverage   82.08%   82.01%   -0.07%     
==========================================
  Files          56       56              
  Lines        6090     6090              
  Branches     1272     1272              
==========================================
- Hits         4999     4995       -4     
- Misses        863      865       +2     
- Partials      228      230       +2     

Impacted Files	Coverage Δ
tests/test_quantumGraph.py	95.42% <0.00%> (-0.66%)	⬇️
python/lsst/pipe/base/graph/graph.py	81.47% <0.00%> (-0.55%)	⬇️

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