Bump starlette from 0.47.1 to 0.49.1 in /samples/adk-sql-agent

Bumps [starlette](https://github.com/Kludex/starlette) from 0.47.1 to 0.49.1.
- [Release notes](https://github.com/Kludex/starlette/releases)
- [Changelog](https://github.com/Kludex/starlette/blob/main/docs/release-notes.md)
- [Commits](Kludex/starlette@0.47.1...0.49.1)

---
updated-dependencies:
- dependency-name: starlette
  dependency-version: 0.49.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

samples/adk-sql-agent/requirements.txt

@@ -863,9 +863,9 @@ sse-starlette==2.4.1 \
     --hash=sha256:08b77ea898ab1a13a428b2b6f73cfe6d0e607a7b4e15b9bb23e4a37b087fd39a \
     --hash=sha256:7c8a800a1ca343e9165fc06bbda45c78e4c6166320707ae30b416c42da070926
     # via mcp
-starlette==0.47.1 \
-    --hash=sha256:5e11c9f5c7c3f24959edbf2dffdc01bba860228acf657129467d8a7468591527 \
-    --hash=sha256:aef012dd2b6be325ffa16698f9dc533614fb1cebd593a906b90dc1025529a79b
+starlette==0.49.1 \
+    --hash=sha256:481a43b71e24ed8c43b11ea02f5353d77840e01480881b8cb5a26b8cae64a8cb \
+    --hash=sha256:d92ce9f07e4a3caa3ac13a79523bd18e3bc0042bb8ff2d759a8e7dd0e1859875
     # via
     #   fastapi
     #   google-adk