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 

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[musicinmybrain]

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