ci(sync-upstream): update settings (#19)

Signed-off-by: Kenji Miyake <kenji.miyake@tier4.jp>

.github/workflows/sync-upstream.yaml

@@ -2,7 +2,7 @@ name: sync-upstream
 
 on:
   schedule:
-    - cron: 0 19 * * * # run at 4 AM JST
+    - cron: 0 0 * * *
   workflow_dispatch:
 
 jobs:
@@ -17,12 +17,12 @@ jobs:
           private_key: ${{ secrets.PRIVATE_KEY }}
 
       - name: Run sync-branches
-        uses: autowarefoundation/autoware-github-actions/sync-branches@tier4/proposal
+        uses: autowarefoundation/autoware-github-actions/sync-branches@v1
         with:
           token: ${{ steps.generate-token.outputs.token }}
           base-branch: tier4/main
           sync-pr-branch: sync-upstream
           sync-target-repository: https://github.com/autowarefoundation/autoware.universe.git
-          sync-target-branch: tier4/proposal
+          sync-target-branch: main
           pr-title: "chore: sync upstream"
           auto-merge-method: merge