git-clone taks and updates

_CI-CD/tektoncd-git-clone-task.yaml

@@ -37,7 +37,7 @@ spec:
     - name: deleteExisting
       description: clean out the contents of the repo's destination directory (if it already exists) before trying to clone the repo there
       type: string
-      default: "false"
+      default: "true"
     - name: httpProxy
       description: git HTTP proxy server for non-SSL requests
       type: string
@@ -55,7 +55,7 @@ spec:
       description: The precise commit SHA that was fetched by this Task
   steps:
     - name: clone
-      image: gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/git-init:v0.12.1
+      image: gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/git-init:v0.30.2
       script: |
         CHECKOUT_DIR="$(workspaces.output.path)/$(params.subdirectory)"