JENKINS-69581: Update required java version

As of Jenkins Weekly 2.357 and LTS 2.361 the minimum required java
version is java 11.

If the command java -fullversion fails we will try to install openjdk-11.

We first try and install it using amazon-linux-extras. If this passes
then the launch continues. If it fails (for example we're launching a
linux node on a distribution other than amazon-linux we try and install
openjdk-11 using yum.

If both of these commands fail we won't launch the node.

At this point we don't explicitly check the java version, but this could
perhaps be a future addition.

src/main/java/hudson/plugins/ec2/ssh/EC2UnixLauncher.java

@@ -236,7 +236,7 @@ protected void launchScript(EC2Computer computer, TaskListener listener) throws
 
             // TODO: parse the version number. maven-enforcer-plugin might help
             final String javaPath = node.javaPath;
-            executeRemote(computer, conn, javaPath + " -fullversion", "sudo yum install -y java-1.8.0-openjdk.x86_64", logger, listener);
+            executeRemote(computer, conn, javaPath + " -fullversion", "sudo amazon-linux-extras install java-openjdk11 -y; sudo yum install -y fontconfig java-11-openjdk", logger, listener);
             executeRemote(computer, conn, "which scp", "sudo yum install -y openssh-clients", logger, listener);
 
             // Always copy so we get the most recent remoting.jar