Bump starlette from 0.37.2 to 0.40.0 in /python-flask

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]>

python-flask/requirements-db.txt

@@ -51,6 +51,8 @@ flask-sqlalchemy==3.1.1
     # via
     #   -r requirements-db.in
     #   flask-migrate
+greenlet==3.1.1
+    # via sqlalchemy
 h11==0.14.0
     # via
     #   httpcore
@@ -167,7 +169,7 @@ sqlalchemy-json==0.7.0
     # via -r requirements-db.in
 sqlalchemy-utils==0.41.2
     # via -r requirements-db.in
-starlette==0.37.2
+starlette==0.40.0
     # via connexion
 swagger-ui-bundle==1.1.0
     # via