Bump starlette from 0.19.1 to 0.47.3

Bumps [starlette](https://github.com/encode/starlette) from 0.19.1 to 0.47.3.
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](Kludex/starlette@0.19.1...0.47.3)

---
updated-dependencies:
- dependency-name: starlette
  dependency-version: 0.47.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/requirements.txt

@@ -227,9 +227,9 @@ sqlalchemy==1.4.45 ; python_version >= "3.8" and python_version < "4.0" \
     --hash=sha256:f61e54b8c2b389de1a8ad52394729c478c67712dbdcdadb52c2575e41dae94a5 \
     --hash=sha256:f7944b04e6fcf8d733964dd9ee36b6a587251a1a4049af3a9b846f6e64eb349a \
     --hash=sha256:fd69850860093a3f69fefe0ab56d041edfdfe18510b53d9a2eaecba2f15fa795
-starlette==0.19.1 ; python_version >= "3.8" and python_version < "4.0" \
-    --hash=sha256:5a60c5c2d051f3a8eb546136aa0c9399773a689595e099e0877704d5888279bf \
-    --hash=sha256:c6d21096774ecb9639acad41b86b7706e52ba3bf1dc13ea4ed9ad593d47e24c7
+starlette==0.47.3 ; python_version >= "3.8" and python_version < "4.0" \
+    --hash=sha256:6bc94f839cc176c4858894f1f8908f0ab79dfec1a6b8402f6da9be26ebea52e9 \
+    --hash=sha256:89c0778ca62a76b826101e7c709e70680a1699ca7da6b44d38eb0a7e61fe4b51
 toml==0.10.2 ; python_version >= "3.8" and python_version < "4.0" \
     --hash=sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b \
     --hash=sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f