pip(deps): bump starlette from 0.40.0 to 0.46.2 in /backend (#93)

Bumps [starlette](https://github.com/encode/starlette) from 0.40.0 to 0.46.2.
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](Kludex/starlette@0.40.0...0.46.2)

---
updated-dependencies:
- dependency-name: starlette
  dependency-version: 0.46.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: garotm <gmconklin@gmail.com>

Author: dependabot[bot]

backend/requirements.txt

@@ -9,8 +9,8 @@ google-api-python-client>=2.0.0
 pyjwt==2.10.*
 requests==2.32.*
 python-dateutil==2.9.*
+starlette==0.46.2
 fastapi==0.115.12
-starlette==0.40.0
 pydantic==2.4.2
 python-multipart==0.0.20
 python-dotenv>=0.19.0