Update dependency io.wcm.devops.conga:io.wcm.devops.conga.generator to v1.18.0

Author: renovate[bot]

conga-sling-plugin/pom.xml

@@ -60,7 +60,7 @@
     <dependency>
       <groupId>io.wcm.devops.conga</groupId>
       <artifactId>io.wcm.devops.conga.generator</artifactId>
-      <version>1.18.0-SNAPSHOT</version>
+      <version>1.18.0</version>
       <scope>compile</scope>
     </dependency>