remove cert manager url

Signed-off-by: Francisco Vila <fvila@redhat.com>

Author: franvila

kroxylicious-systemtests/src/main/java/io/kroxylicious/systemtests/Constants.java

@@ -120,10 +120,6 @@ private Constants() {
     public static final String KCAT_CLIENT_IMAGE = "quay.io/kroxylicious/kcat:1.7.1";
     public static final String KAF_CLIENT_IMAGE = "quay.io/kroxylicious/kaf:v0.2.7";
 
-    /**
-     * The cert manager url to install it on kubernetes
-     */
-    public static final String CERT_MANAGER_URL = "https://github.com/cert-manager/cert-manager/releases/latest/download/cert-manager.yaml";
     /**
      * the kubernetes labels used to identify the test kafka clients pods
      */