Revert to earlier workflow libraries and bump back core jenkins dependency version

Author: svanoort

pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.jenkins-ci.plugins</groupId>
         <artifactId>plugin</artifactId>
-        <version>1.609</version>
+        <version>1.580.1</version>
     </parent>
 
     <licenses>
@@ -68,19 +68,19 @@
         <dependency>
             <groupId>org.jenkins-ci.plugins.workflow</groupId>
             <artifactId>workflow-job</artifactId>
-            <version>1.8</version>
+            <version>1.4</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.jenkins-ci.plugins.workflow</groupId>
             <artifactId>workflow-cps</artifactId>
-            <version>1.8</version>
+            <version>1.4</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.jenkins-ci.plugins.workflow</groupId>
             <artifactId>workflow-basic-steps</artifactId>
-            <version>1.8</version>
+            <version>1.4</version>
             <scope>test</scope>
         </dependency>