fix:Avoid accessing static methods of a class through its object reference (#10450)

oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/resolver/MetricsQuery.java

@@ -102,7 +102,7 @@ public class MetricsQuery implements GraphQLQueryResolver {
      * Metrics definition metadata query. Response the metrics type which determines the suitable query methods.
      */
     public MetricsType typeOfMetrics(String name) throws IOException {
-        return getMetricsMetadataQueryService().typeOfMetrics(name);
+        return MetricsMetadataQueryService.typeOfMetrics(name);
     }
 
     /**