chore(deps): bump com.netflix.graphql.dgs:graphql-dgs-spring-boot-starter

Bumps [com.netflix.graphql.dgs:graphql-dgs-spring-boot-starter](https://github.com/Netflix/dgs-framework) from 5.3.0 to 7.6.0.
- [Release notes](https://github.com/Netflix/dgs-framework/releases)
- [Commits](Netflix/dgs-framework@v5.3.0...v7.6.0)

---
updated-dependencies:
- dependency-name: com.netflix.graphql.dgs:graphql-dgs-spring-boot-starter
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/api/build.gradle

@@ -53,7 +53,7 @@ dependencies {
     implementation('org.springframework.boot:spring-boot-starter-web')
 
     // GraphQL and GraphiQL (via Netflix Data Graph Service (DGS))
-    implementation "com.netflix.graphql.dgs:graphql-dgs-spring-boot-starter:5.3.0"
+    implementation "com.netflix.graphql.dgs:graphql-dgs-spring-boot-starter:7.6.0"
     implementation "com.graphql-java:graphql-java-extended-scalars:21.0"
 
     testImplementation "org.springframework.boot:spring-boot-starter-test:3.1.5"