Upgrade Lombok version (#10000)

- 1.18.18 includes fixes for IDE compatibility (IntelliJ, Eclipse, Netbeans).
  This is relevant while developing Pulsar.
  - see https://projectlombok.org/changelog for more details
diff --git a/pom.xml b/pom.xml
index 6eeb463..23397b6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -176,7 +176,7 @@
     <hppc.version>0.7.3</hppc.version>
     <spark-streaming_2.10.version>2.1.0</spark-streaming_2.10.version>
     <assertj-core.version>3.18.1</assertj-core.version>
-    <lombok.version>1.18.16</lombok.version>
+    <lombok.version>1.18.18</lombok.version>
     <javax.annotation-api.version>1.2</javax.annotation-api.version>
     <jaxb-api>2.3.1</jaxb-api>
     <javax.activation.version>1.2.0</javax.activation.version>