Update strawberry-graphql[channels] requirement in /caster-back

Updates the requirements on [strawberry-graphql[channels]](https://github.com/strawberry-graphql/strawberry) to permit the latest version.
- [Release notes](https://github.com/strawberry-graphql/strawberry/releases)
- [Changelog](https://github.com/strawberry-graphql/strawberry/blob/main/CHANGELOG.md)
- [Commits](strawberry-graphql/strawberry@0.5.6...0.217.0)

---
updated-dependencies:
- dependency-name: strawberry-graphql[channels]
  dependency-type: direct:production
...

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

caster-back/requirements.txt

@@ -4,7 +4,7 @@ psycopg2-binary==2.9.9
 python-osc==1.8.1
 google-cloud-texttospeech==2.14.1
 strawberry-graphql-django==0.17.2
-strawberry-graphql[channels]<=0.208.2
+strawberry-graphql[channels]<=0.217.0
 django-cors-headers==4.0.0
 mistletoe==1.2.1
 pydantic==1.10.7