Bump maven-core in /plugins/maven/graphql-java-codegen-maven-plugin

Bumps [maven-core](https://github.com/apache/maven) from 3.8.1 to 3.9.1.
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.8.1...maven-3.9.1)

---
updated-dependencies:
- dependency-name: org.apache.maven:maven-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

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

@@ -57,7 +57,7 @@
 
     <properties>
         <version.maven-plugin-api>3.8.1</version.maven-plugin-api>
-        <version.maven-core>3.8.1</version.maven-core>
+        <version.maven-core>3.9.1</version.maven-core>
         <version.maven-plugin-annotations>3.8.1</version.maven-plugin-annotations>
         <version.maven-plugin-plugin>3.8.1</version.maven-plugin-plugin>
         <version.maven-compiler-plugin>3.8.1</version.maven-compiler-plugin>