Updates Groovy to 4.0.21; fixes gh-2084

Author: marcingrzejszczak

pom.xml

@@ -54,7 +54,7 @@
 		<testcontainers.version>1.17.6</testcontainers.version>
 
 		<!-- We need to have compatibility with Gradle -->
-		<groovy.version>4.0.16</groovy.version>
+		<groovy.version>4.0.21</groovy.version>
 		<!-- We need to have compatibility with Boot -->
 		<maven.version>3.6.3</maven.version>
 		<maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>