Bump starlette from 0.19.1 to 0.48.0

Bumps [starlette](https://github.com/Kludex/starlette) from 0.19.1 to 0.48.0.
- [Release notes](https://github.com/Kludex/starlette/releases)
- [Changelog](https://github.com/Kludex/starlette/blob/main/docs/release-notes.md)
- [Commits](Kludex/starlette@0.19.1...0.48.0)

---
updated-dependencies:
- dependency-name: starlette
  dependency-version: 0.48.0
  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==0.48.0 ; python_version >= "3.8" and python_version < "4.0" \
+    --hash=sha256:0764ca97b097582558ecb498132ed0c7d942f233f365b86ba37770e026510659 \
+    --hash=sha256:7e8cee469a8ab2352911528110ce9088fdc6a37d9876926e73da7ce4aa4c7a46
 toml==0.10.2 ; python_version >= "3.8" and python_version < "4.0" \
     --hash=sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b \
     --hash=sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f