Bump starlette from 0.37.2 to 0.40.0 in /docs (#2730)

Bumps [starlette](https://github.com/encode/starlette) from 0.37.2 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@0.37.2...0.40.0)

---
updated-dependencies:
- dependency-name: starlette
  dependency-type: indirect
...

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

docs/requirements.txt

@@ -22,7 +22,7 @@ colorama==0.4.6
     # via sphinx-autobuild
 docutils==0.19
     # via
-    #   -r docs/requirements.in
+    #   -r requirements.in
     #   sphinx
 exceptiongroup==1.2.1
     # via anyio
@@ -36,11 +36,11 @@ imagesize==1.4.1
     # via sphinx
 jinja2==2.11.3
     # via
-    #   -r docs/requirements.in
+    #   -r requirements.in
     #   sphinx
 markupsafe==2.0.1
     # via
-    #   -r docs/requirements.in
+    #   -r requirements.in
     #   jinja2
 packaging==24.1
     # via sphinx
@@ -54,11 +54,11 @@ snowballstemmer==2.2.0
     # via sphinx
 sphinx==5.1.1
     # via
-    #   -r docs/requirements.in
+    #   -r requirements.in
     #   sphinx-autobuild
     #   sphinxcontrib-plantuml
 sphinx-autobuild==2024.10.3
-    # via -r docs/requirements.in
+    # via -r requirements.in
 sphinxcontrib-applehelp==1.0.8
     # via sphinx
 sphinxcontrib-devhelp==1.0.6
@@ -68,12 +68,12 @@ sphinxcontrib-htmlhelp==2.0.5
 sphinxcontrib-jsmath==1.0.1
     # via sphinx
 sphinxcontrib-plantuml==0.30
-    # via -r docs/requirements.in
+    # via -r requirements.in
 sphinxcontrib-qthelp==1.0.7
     # via sphinx
 sphinxcontrib-serializinghtml==1.1.10
     # via sphinx
-starlette==0.37.2
+starlette==0.40.0
     # via sphinx-autobuild
 typing-extensions==4.12.2
     # via