Bump graphql-java in /plugins/maven/graphql-java-codegen-maven-plugin (#1267)

Bumps [graphql-java](https://github.com/graphql-java/graphql-java) from 20.2 to 21.0.
- [Release notes](https://github.com/graphql-java/graphql-java/releases)
- [Commits](graphql-java/graphql-java@v20.2...v21.0)

---
updated-dependencies:
- dependency-name: com.graphql-java:graphql-java
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

plugins/maven/graphql-java-codegen-maven-plugin/pom.xml

@@ -121,7 +121,7 @@
         <dependency>
             <groupId>com.graphql-java</groupId>
             <artifactId>graphql-java</artifactId>
-            <version>20.2</version>
+            <version>21.0</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>