Update ci.yml

Node.js 16 actions are deprecated; first try for Node.js 20 actions reference.

.github/workflows/ci.yml

@@ -8,24 +8,24 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
           token:  ${{ secrets.GITHUB_TOKEN }}
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
           ref: 1.4.0
           path: ./tmp-update-repo
           token:  ${{ secrets.GITHUB_TOKEN }}
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 1
           repository: esmero/archipelago-deployment
           ref: 1.4.0
           path: ./archipelago-deployment
           token:  ${{ secrets.GITHUB_TOKEN }}
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 1
           repository: esmero/archipelago-deployment-live