Fixes CI

[hbcarlos]

This PR pins FastAPI to check whether the error comes from this release of FastAPI

Removes response_model from endpoints that don't return anything.
We could also use response_mode=None.

[codecov-commenter]

Codecov Report

Base: 82.90% // Head: 82.04% // Decreases project coverage by -0.85% ⚠️

Coverage data is based on head (992c995) compared to base (d250338).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #559      +/-   ##
==========================================
- Coverage   82.90%   82.04%   -0.86%     
==========================================
  Files          78       78              
  Lines        5977     5987      +10     
==========================================
- Hits         4955     4912      -43     
- Misses       1022     1075      +53     

Impacted Files	Coverage Δ
quetz/dao.py	91.12% <100.00%> (+0.03%)	⬆️
quetz/main.py	86.85% <100.00%> (+0.14%)	⬆️
quetz/pkgstores.py	42.45% <0.00%> (-11.60%)	⬇️

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[brichet]

Thanks @hbcarlos