Target platform: Fix testfx version

#3842 changed testfx version in some modules but didn't update target platform

Author: kasemir

dependencies/phoebus-target/pom.xml

@@ -392,13 +392,13 @@
     <dependency>
       <groupId>org.testfx</groupId>
       <artifactId>testfx-core</artifactId>
-      <version>4.0.13-alpha</version>
+      <version>4.0.18</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.testfx</groupId>
-      <artifactId>testfx-junit</artifactId>
-      <version>4.0.13-alpha</version>
+      <artifactId>testfx-junit5</artifactId>
+      <version>4.0.18</version>
       <scope>test</scope>
       <exclusions>
         <exclusion>