Merge pull request #534 from graphql-java-kickstart/renovate/major-lib_graphql_java_ver

fix(deps): update dependency com.graphql-java:graphql-java to v21

Author: oliemansm

gradle.properties

@@ -7,7 +7,7 @@ PROJECT_LICENSE=MIT
 PROJECT_LICENSE_URL=https://github.com/graphql-java-kickstart/spring-java-servlet/blob/master/LICENSE.md
 PROJECT_DEV_ID=oliemansm
 PROJECT_DEV_NAME=Michiel Oliemans
-LIB_GRAPHQL_JAVA_VER=20.4
+LIB_GRAPHQL_JAVA_VER=21.0
 LIB_JACKSON_VER=2.15.2
 LIB_SLF4J_VER=2.0.7
 LIB_LOMBOK_VER=1.18.28