Remove mockito-inline from tests (#1440)

https://github.com/jenkinsci/plugin-pom/releases/tag/plugin-4.60

mockito-inline was removed in mockito/mockito#2945, replaced with mockito-core.

pom.xml

@@ -4,7 +4,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>4.59</version>
+    <version>4.60</version>
     <relativePath />
   </parent>
 
@@ -154,11 +154,6 @@
       <artifactId>mockito-core</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.mockito</groupId>
-      <artifactId>mockito-inline</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>nl.jqno.equalsverifier</groupId>
       <artifactId>equalsverifier</artifactId>