Bump starlette from 0.38.5 to 0.40.0 in /requirements in the pip group

Bumps the pip group in /requirements with 1 update: [starlette](https://github.com/encode/starlette).


Updates `starlette` from 0.38.5 to 0.40.0
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](encode/starlette@0.38.5...0.40.0)

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

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

requirements/requirements.txt

@@ -30,7 +30,7 @@ rasterio>=1.3.6
 requests==2.32.3
 scikit-learn==1.5.1
 setuptools==75.1.0
-starlette==0.38.5 # not directly required, pinned by Dependabot to avoid a vulnerability.
+starlette==0.40.0 # not directly required, pinned by Dependabot to avoid a vulnerability.
 tabulate==0.9.0
 tensorflow==2.17.0
 tifffile==2024.1.30