upgrade to python 3.10 (and pydantic2)

[keighrim]

fixes #228

[codecov]

Codecov Report

❌ Patch coverage is 85.29412% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.67%. Comparing base (2753eae) to head (241f395).
⚠️ Report is 11 commits behind head on develop.

Files with missing lines	Patch %	Lines
clams/appmetadata/__init__.py	84.61%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #248      +/-   ##
===========================================
- Coverage    72.86%   70.67%   -2.20%     
===========================================
  Files            9        6       -3     
  Lines          807      641     -166     
===========================================
- Hits           588      453     -135     
+ Misses         219      188      -31     

Flag	Coverage Δ
unittests	70.67% <85.29%> (-2.20%)	⬇️

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