⬆️ Update peter-evans/create-pull-request action to v6

Author: renovate[bot]

.github/workflows/update.yaml

@@ -37,7 +37,7 @@ jobs:
         run: pnpm fmt:data
 
       - name: Create pull request
-        uses: peter-evans/create-pull-request@v5
+        uses: peter-evans/create-pull-request@v6
         with:
           commit-message: 🍱 ポエムを更新
           branch: ${{ env.NEW_BRANCH_NAME }}