Merge pull request #198 from apache/dependabot/maven/groovy.version-3.0.21

Bump groovy.version from 3.0.20 to 3.0.21
diff --git a/pom.xml b/pom.xml
index 43ac663..a18e6f6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,7 +30,7 @@
   <properties>
     <maven.compiler.release>11</maven.compiler.release>
     <asm.version>9.6</asm.version>
-    <groovy.version>3.0.20</groovy.version>
+    <groovy.version>3.0.21</groovy.version>
     <project.build.outputTimestamp>1631003912</project.build.outputTimestamp>
   </properties>