Bump nl.jqno.equalsverifier:equalsverifier from 3.18 to 3.18.1 (jenkinsci#1239)

Author: dependabot[bot]

pom.xml

@@ -213,7 +213,7 @@
     <dependency>
       <groupId>nl.jqno.equalsverifier</groupId>
       <artifactId>equalsverifier</artifactId>
-      <version>3.18</version>
+      <version>3.18.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>