Bump sse-starlette from 1.6.1 to 1.6.5

Bumps [sse-starlette](https://github.com/sysid/sse-starlette) from 1.6.1 to 1.6.5.
- [Release notes](https://github.com/sysid/sse-starlette/releases)
- [Changelog](https://github.com/sysid/sse-starlette/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sysid/sse-starlette/compare/v1.6.1...v1.6.5)

---
updated-dependencies:
- dependency-name: sse-starlette
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>