⬆ Update starlette requirement (#290)

Updates the requirements on [starlette](https://github.com/encode/starlette) to permit the latest version.
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](encode/starlette@0.14.2...0.21.0)

---
updated-dependencies:
- dependency-name: starlette
  dependency-type: direct:production
...

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pyproject.toml

@@ -40,7 +40,7 @@ dependencies = [
     "databases == 0.6.2",
     "motor == 3.0.0",
     "Authlib==0.15.5",
-    "starlette >=0.14.02,<0.20.4",
+    "starlette >=0.14.02,<0.21.1",
     "aioredis >=2.0.1,<2.1.0",
     "redis >=4.3.3,<4.3.5",
     "pytz==2022.6",