chore: pydantic 2.11

[sfoster1]

Bumps the system to use pydantic 2.11, which has much less memory usage when building model classes.

Pretty well tested on flex and ot-2 (ot-2 requires the buildroot pr).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.82%. Comparing base (9964abd) to head (bb401e1).
Report is 4 commits behind head on edge.

Additional details and impacted files

@@            Coverage Diff             @@
##             edge   #18872      +/-   ##
==========================================
- Coverage   23.82%   23.82%   -0.01%     
==========================================
  Files        3329     3329              
  Lines      287227   287232       +5     
  Branches    35927    35927              
==========================================
  Hits        68420    68420              
- Misses     218781   218786       +5     
  Partials       26       26              

Flag	Coverage Δ
protocol-designer	19.03% <ø> (-0.01%)	⬇️
step-generation	5.32% <ø> (-0.01%)	⬇️

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[SyntaxColoring]

Looks good once tests pass. Changes requested for a Makefile change that I think is accidental.

[SyntaxColoring]

Oh, tests are failing in edge, I think.

[SyntaxColoring]

Thanks!