Update template & switch to Pydantic V2

[jluethi]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 55.47%. Comparing base (4fc3c85) to head (1f6a4a4).

Files	Patch %	Lines
src/fractal_helper_tasks/__init__.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   55.31%   55.47%   +0.16%     
==========================================
  Files           2        3       +1     
  Lines         141      146       +5     
==========================================
+ Hits           78       81       +3     
- Misses         63       65       +2     

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