Fix the busybox image tag in kubemark hollow nodes

Author: tosi3k

test/kubemark/resources/hollow-node_template.yaml

@@ -17,7 +17,7 @@ spec:
     spec:
       initContainers:
       - name: init-inotify-limit
-        image: busybox
+        image: busybox:1.32
         command: ['sysctl', '-w', 'fs.inotify.max_user_instances=1000']
         securityContext:
           privileged: true