chore(core-api): Fix invalid token maybe

[ptitmouton]

See #391

[lotta-argocd-notification]

Preview-Anwendung wurde erfolgreich deployed.
Erreichbar unter: https://*.preview-395.lotta.schule
Beispiel: https://info.preview-395.lotta.schule

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 70.95%. Comparing base (5b820d6) to head (17e7825).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
apps/core-api/lib/lotta_web/auth/error_handler.ex	0.00%	4 Missing ⚠️
apps/core-api/lib/lotta_web/auth/access_token.ex	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #395      +/-   ##
==========================================
- Coverage   71.10%   70.95%   -0.16%     
==========================================
  Files          89       89              
  Lines        1848     1852       +4     
==========================================
  Hits         1314     1314              
- Misses        534      538       +4     

Flag	Coverage Δ
core-api	70.95% <0.00%> (-0.16%)	⬇️

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[ptitmouton]

Problem durch Korrigieren ungültiger Daten lösbar.