chore: use code-suggester in github action

.github/workflows/main.yml

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8bb2bf1..fe8ffbb 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,6 +20,10 @@
     # * is a special character in YAML so you have to quote this string
     # Run this Github Action every Tuesday at 7 AM UTC
     - cron:  '0 7 * * 2'
+  # For testing purposes
+  pull_request:
+    branches:
+      - main
 
 jobs:
   build:
@@ -83,43 +87,17 @@
         working-directory: ./scripts
 
       - name: Create PR
-        uses: actions/github-script@v6.4.1
+        uses: googleapis/code-suggester@v4
+        env:
+          ACCESS_TOKEN: ${{ secrets.YOSHI_CODE_BOT_TOKEN }}
         with:
-          github-token: ${{secrets.YOSHI_CODE_BOT_TOKEN}}
-          script: |
-            async function createPR () {
-              const { owner, repo } = context.repo
-              const branch = 'update-discovery-artifacts-${{ steps.date.outputs.current_date }}'
-              let prBody = `${{ steps.pr_body.outputs.change_summary }}`
-              const prTitle = 'chore: Update discovery artifacts'
-              const pullRequests = await github.rest.pulls.list({
-                owner: owner,
-                repo: repo,
-                head: `${owner}:${branch}`,
-                state: 'open'
-              })
+          command: pr
+          force: true
+          upstream_owner: googleapis
+          upstream_repo: google-api-python-client
+          description: ${{ steps.pr_body.outputs.change_summary }}
+          title: 'chore: Update discovery artifacts'
+          message: 'chore: Update discovery artifacts'
+          branch: 'update-discovery-artifacts-${{ steps.date.outputs.current_date }}'
+          git_dir: '.'
 
-              if (pullRequests.data.length === 1) {
-                prNumber = pullRequests.data[0].number
-                await github.rest.pulls.update({
-                  owner: owner,
-                  repo: repo,
-                  pull_number: prNumber,
-                  title: prTitle,
-                  body: prBody
-                })
-                console.log('Updated PR')
-              } else {
-                const createPrResult = await github.rest.pulls.create({
-                  owner: owner,
-                  repo: repo,
-                  base: 'main',
-                  head: `${owner}:${branch}`,
-                  title: prTitle,
-                  body: prBody
-                })
-                prNumber = createPrResult.data.number
-                console.log('Created PR')
-              }
-            }
-            createPR()