Pydantic 2.x compatibility

[fsoubelet]

Migrates to requiring pydantic >= 2.0 and makes the necessary changes for the new major version.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (064d6e3) 98.51% compared to head (2e9de5f) 98.51%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #106   +/-   ##
=======================================
  Coverage   98.51%   98.51%           
=======================================
  Files          57       57           
  Lines        2565     2566    +1     
=======================================
+ Hits         2527     2528    +1     
  Misses         38       38           

Impacted Files	Coverage Δ
pyhdtoolkit/models/beam.py	100.00% <100.00%> (ø)
pyhdtoolkit/models/htc.py	100.00% <100.00%> (ø)
pyhdtoolkit/version.py	100.00% <100.00%> (ø)

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