chore(deps): bump the python group across 1 directory with 2 updates

Updates the requirements on [starlette](https://github.com/Kludex/starlette) and [uv-build](https://github.com/astral-sh/uv) to permit the latest version.

Updates `starlette` from 0.49.3 to 0.50.0
- [Release notes](https://github.com/Kludex/starlette/releases)
- [Changelog](https://github.com/Kludex/starlette/blob/main/docs/release-notes.md)
- [Commits](Kludex/starlette@0.49.3...0.50.0)

Updates `uv-build` to 0.9.18
- [Release notes](https://github.com/astral-sh/uv/releases)
- [Changelog](https://github.com/astral-sh/uv/blob/main/CHANGELOG.md)
- [Commits](astral-sh/uv@0.7.21...0.9.18)

---
updated-dependencies:
- dependency-name: starlette
  dependency-version: 0.50.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python
- dependency-name: uv-build
  dependency-version: 0.9.18
  dependency-type: direct:development
  dependency-group: python
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

example/pyproject.toml

@@ -5,11 +5,11 @@ dependencies = [
   "connect-python",
   "flask==3.1.2",
   "protobuf>=5.28",
-  "starlette==0.49.3",
+  "starlette==0.50.0",
 ]
 
 [build-system]
-requires = ["uv_build>=0.7.21,<0.8.0"]
+requires = ["uv_build>=0.7.21,<0.10.0"]
 build-backend = "uv_build"
 
 [tool.ruff]