Update dependency org.codehaus.gmavenplus:gmavenplus-plugin to v1.8.1

Author: renovate-bot

functions/snippets/pom.xml

@@ -165,7 +165,7 @@
       <plugin>
         <groupId>org.codehaus.gmavenplus</groupId>
         <artifactId>gmavenplus-plugin</artifactId>
-        <version>1.7.0</version>
+        <version>1.8.1</version>
         <executions>
           <execution>
             <id>groovy-compile</id>