Bump starlette from 1.0.1 to 1.3.1 in /docs (#169)

Bumps [starlette](https://github.com/Kludex/starlette) from 1.0.1 to 1.3.1.
- [Release notes](https://github.com/Kludex/starlette/releases)
- [Changelog](https://github.com/Kludex/starlette/blob/main/docs/release-notes.md)
- [Commits](Kludex/starlette@1.0.1...1.3.1)

---
updated-dependencies:
- dependency-name: starlette
  dependency-version: 1.3.1
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/requirements.txt

@@ -46,7 +46,7 @@ sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==2.0.0
 sphinxcontrib-serializinghtml==2.0.0
 sphinxext-opengraph==0.13.0
-starlette==1.0.1
+starlette==1.3.1
 typing-extensions==4.15.0
 urllib3==2.7.0
 uvicorn==0.46.0