chore: bump Pydantic to v2

[DonDebonair]

No description provided.

[codecov]

Codecov Report

Merging #840 (39b7b2d) into main (a48f375) will decrease coverage by 0.09%.
Report is 3 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #840      +/-   ##
==========================================
- Coverage   74.19%   74.10%   -0.09%     
==========================================
  Files          26       26              
  Lines        1267     1263       -4     
==========================================
- Hits          940      936       -4     
  Misses        327      327              

Files Changed	Coverage Δ
machine/clients/slack.py	64.67% <100.00%> (ø)
machine/models/channel.py	100.00% <100.00%> (ø)
machine/models/user.py	100.00% <100.00%> (ø)