Bump strawberry-graphql from 0.250.1 to 0.256.1 in /ci/latest

Bumps [strawberry-graphql](https://github.com/strawberry-graphql/strawberry) from 0.250.1 to 0.256.1.
- [Release notes](https://github.com/strawberry-graphql/strawberry/releases)
- [Changelog](https://github.com/strawberry-graphql/strawberry/blob/main/CHANGELOG.md)
- [Commits](strawberry-graphql/strawberry@0.250.1...0.256.1)

---
updated-dependencies:
- dependency-name: strawberry-graphql
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

ci/latest/requirements.txt

@@ -5,7 +5,7 @@ nextline==0.7.19
 apluggy==1.0.3
 dynaconf==3.2.6
 starlette==0.41.3
-strawberry-graphql==0.250.1
+strawberry-graphql==0.256.1
 websockets==14.1
 rich==13.9.4
 async-asgi-testclient==1.4.11