Use github action to merge the bump PR

Author: ChengYanJin

.github/workflows/post-release.yml

@@ -35,6 +35,18 @@ jobs:
               repo: context.repo.repo,
               body: '/approve'
             })
+      - uses: actions/github-script@v5
+        if: ${{ steps.cpr.outputs.pull-request-number }}
+        with:
+          github-token: ${{secrets.GIT_ACCESS_TOKEN}}
+          script: |
+            await github.rest.pulls.merge({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: ${{ steps.cpr.outputs.pull-request-number }},
+              merge_method: 'merge'
+            })
+
   publish-npm:
     runs-on: ubuntu-latest
     permissions: