Bump org.springframework.graphql:spring-graphql from 1.2.8 to 1.2.9 (#9585)

Bumps [org.springframework.graphql:spring-graphql](https://github.com/spring-projects/spring-graphql) from 1.2.8 to 1.2.9.
- [Release notes](https://github.com/spring-projects/spring-graphql/releases)
- [Commits](https://github.com/spring-projects/spring-graphql/compare/v1.2.8...v1.2.9)

---
updated-dependencies:
- dependency-name: org.springframework.graphql:spring-graphql
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -110,7 +110,7 @@ ext {
     smackVersion = '4.4.8'
     springAmqpVersion = '3.1.7'
     springDataVersion = '2023.1.11'
-    springGraphqlVersion = '1.2.8'
+    springGraphqlVersion = '1.2.9'
     springKafkaVersion = '3.1.9'
     springRetryVersion = '2.0.10'
     springSecurityVersion = '6.2.7'