Bumped dep to get it compiled wo missing com.github.jnr:jffi, bumped …

…again JENKINS-19031

pom.xml

@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>org.jenkins-ci.plugins</groupId>
 		<artifactId>plugin</artifactId>
-		<version>1.520</version>
+		<version>1.557</version>
 	</parent>
 
 	<groupId>org.zeroturnaround</groupId>
@@ -17,14 +17,14 @@
 	<repositories>
 		<repository>
 			<id>repo.jenkins-ci.org</id>
-			<url>http://repo.jenkins-ci.org/public/</url>
+			<url>https://repo.jenkins-ci.org/public/</url>
 		</repository>
 	</repositories>
 
 	<pluginRepositories>
 		<pluginRepository>
 			<id>repo.jenkins-ci.org</id>
-			<url>http://repo.jenkins-ci.org/public/</url>
+			<url>https://repo.jenkins-ci.org/public/</url>
 		</pluginRepository>
 	</pluginRepositories>