Allow FastAPI 0.120 and Starlette 0.49

[musicinmybrain]

This includes the FastAPI update from #1014.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.58%. Comparing base (9f0ff71) to head (37f1f46).
⚠️ Report is 18 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1027   +/-   ##
=======================================
  Coverage   90.58%   90.58%           
=======================================
  Files         150      150           
  Lines        4387     4387           
  Branches      534      534           
=======================================
  Hits         3974     3974           
  Misses        320      320           
  Partials       93       93           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[musicinmybrain]

Now updated to allow FastAPI 0.120 and Starlette 0.49. Starlette 0.49.1 fixes GHSA-7f5h-v6xp-fcq8.