Revert "Bump lombok from 1.18.18 to 1.18.20 in /plugins/maven/example-client (#617)"

This reverts commit c1a6b869

plugins/maven/example-client/pom.xml

@@ -174,7 +174,7 @@
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
-            <version>1.18.20</version>
+            <version>1.18.18</version>
         </dependency>
 
         <dependency>