chore: bump com.netflix.graphql.dgs:graphql-dgs-platform-dependencies

Bumps [com.netflix.graphql.dgs:graphql-dgs-platform-dependencies](https://github.com/Netflix/dgs-framework) from 9.1.0 to 9.2.2.
- [Release notes](https://github.com/Netflix/dgs-framework/releases)
- [Commits](Netflix/dgs-framework@v9.1.0...v9.2.2)

---
updated-dependencies:
- dependency-name: com.netflix.graphql.dgs:graphql-dgs-platform-dependencies
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

backend/build.gradle.kts

@@ -24,7 +24,7 @@ repositories {
 
 dependencyManagement {
     imports {
-        mavenBom("com.netflix.graphql.dgs:graphql-dgs-platform-dependencies:9.1.0")
+        mavenBom("com.netflix.graphql.dgs:graphql-dgs-platform-dependencies:9.2.2")
     }
 }