Updates parent pom to 4.51

command used (but upgrades to 4.53 at the moment):
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64 /opt/maven/apache-maven-3.8.4/bin/mvn -Pjenkins versions:update-parent

4.53 fails with UnsupportedClassVersionError

>  Building with a Jenkinsfile configuration that includes Java 8 will result in a low-level class version error when using version 4.52 or later of the plugin parent POM.
https://www.jenkins.io/doc/developer/tutorial-improve/add-a-jenkinsfile/

Author: froque

pom.xml

@@ -3,7 +3,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>3.53</version>
+    <version>4.51</version>
   </parent>
 
   <artifactId>powershell</artifactId>