ci: update actions workflow

.github/workflows/backend.yml

@@ -16,10 +16,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup Go environment
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v5
         with:
           go-version: "1.23" # The Go version to download (if necessary) and use.
 
@@ -42,20 +42,9 @@ jobs:
           source: "backend/tennis-tournament-finder-backend"
           target: ${{ secrets.DEPLOYMENT_PATH }}
           strip_components: 1
-          # timeout: 120s
-
-      # - name: Deploy
-      #   uses: garygrossgarten/github-action-scp@release
-      #   if: github.event_name != 'pull_request'
-      #   with:
-      #     host: ${{ secrets.HOST }}
-      #     username: ${{ secrets.USERNAME }}
-      #     privateKey: ${{ secrets.SSH_KEY }}
-      #     local: "backend/tennis-tournament-finder-backend"
-      #     remote: ${{ secrets.DEPLOYMENT_PATH }}
 
       - name: Restart Service
-        uses: appleboy/ssh-action@master
+        uses: appleboy/ssh-action@v1.2.0
         if: github.event_name != 'pull_request'
         with:
           host: ${{ secrets.HOST }}