Update Backport Bot workflow

Author: bclozel

.github/workflows/backport-bot.yml

@@ -18,17 +18,7 @@ jobs:
       pull-requests: write
     runs-on: ubuntu-latest
     steps:
-      - name: Check out code
-        uses: actions/checkout@v4
-      - name: Set up Java
-        uses: actions/setup-java@v4
+      - name: Create Backport Issue
+        uses: spring-io/backport-bot@v0.0.1
         with:
-          distribution: 'liberica'
-          java-version: 17
-      - name: Download BackportBot
-        run: wget https://github.com/spring-io/backport-bot/releases/download/latest/backport-bot-0.0.1-SNAPSHOT.jar
-      - name: Backport
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          GITHUB_EVENT: ${{ toJSON(github.event) }}
-        run: java -jar backport-bot-0.0.1-SNAPSHOT.jar --github.accessToken="$GITHUB_TOKEN" --github.event_name "$GITHUB_EVENT_NAME" --github.event "$GITHUB_EVENT"
+          token: ${{ secrets.GITHUB_TOKEN }}