⬆️ Bump starlette from 0.22.0 to 0.27.0 in /docker-images

Bumps [starlette](https://github.com/encode/starlette) from 0.22.0 to 0.27.0.
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](encode/starlette@0.22.0...0.27.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

docker-images/requirements.txt

@@ -1,3 +1,3 @@
 uvicorn[standard]==0.20.0
 gunicorn==20.1.0
-starlette==0.25.0
+starlette==0.27.0