Bump graphql-kotlin-version from 8.5.0 to 9.0.0

Bumps `graphql-kotlin-version` from 8.5.0 to 9.0.0.

Updates `com.expediagroup:graphql-kotlin-ktor-server` from 8.5.0 to 9.0.0
- [Release notes](https://github.com/ExpediaGroup/graphql-kotlin/releases)
- [Commits](ExpediaGroup/graphql-kotlin@8.5.0...9.0.0)

Updates `com.expediagroup:graphql-kotlin-spring-server` from 8.5.0 to 9.0.0
- [Release notes](https://github.com/ExpediaGroup/graphql-kotlin/releases)
- [Commits](ExpediaGroup/graphql-kotlin@8.5.0...9.0.0)

---
updated-dependencies:
- dependency-name: com.expediagroup:graphql-kotlin-ktor-server
  dependency-version: 9.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: com.expediagroup:graphql-kotlin-spring-server
  dependency-version: 9.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ lettuce-version = "6.7.1.RELEASE"
 jackson-version = "2.19.2"
 resilience4j-version = "2.3.0"
 logback-version = "1.5.18"
-graphql-kotlin-version = "8.5.0"
+graphql-kotlin-version = "9.0.0"
 openfeature-version = "1.15.1"
 spring-ai-mcp-version = "1.1.0"
 mcp-version = "0.14.1"