Upgrade to latest docbot action

Signed-off-by: Max Xu <maxs.xu@gmail.com>

Author: maxsxu

.github/workflows/ci-documentbot.yml

@@ -38,19 +38,8 @@ jobs:
       pull-requests: write 
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout action
-        uses: actions/checkout@v3
-        with:
-          repository: apache/pulsar-test-infra
-          ref: master
-
-      - name: Set up Go
-        uses: actions/setup-go@v3
-        with:
-          go-version: 1.18
-
       - name: Labeling
-        uses: ./docbot
+        uses: apache/pulsar-test-infra/docbot@master
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           LABEL_WATCH_LIST: 'doc,doc-required,doc-not-needed,doc-complete'