Fix response model

[Petitoto]

Description

Fix some responses models in endpoints:

• POST /tombola/raffles -> RaffleComplete
• POST /calendar/events/ -> EventReturn

Checklist

• Created tests which fail without the change (if possible)
• All tests passing
• Extended the documentation, if necessary

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0e12c1d) 78.11% compared to head (fc91f68) 78.11%.

❗ Current head fc91f68 differs from pull request most recent head b6fc1be. Consider uploading reports for the commit b6fc1be to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #303   +/-   ##
=======================================
  Coverage   78.11%   78.11%           
=======================================
  Files          77       77           
  Lines        5397     5397           
=======================================
  Hits         4216     4216           
  Misses       1181     1181           

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