build(deps): bump org.apache.groovy:groovy-dateutil from 4.0.27 to 4.0.28 (#363)

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Author: dependabot[bot]

pom.xml

@@ -50,7 +50,7 @@
     <dependency>
       <groupId>org.apache.groovy</groupId>
       <artifactId>groovy-dateutil</artifactId>
-      <version>4.0.27</version>
+      <version>4.0.28</version>
     </dependency>
     <!-- https://mvnrepository.com/artifact/org.codehaus.gpars/gpars -->
     <dependency>