Fix test workflow and update to Node 20

- Added Node.js setup and dependency installation to the test workflow
- Updated action to use Node 20 instead of Node 16
- Ensures dependencies are properly installed before action runs

Author: Cole Kennedy

.github/workflows/test.yml

@@ -15,6 +15,13 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3
 
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '16'
+          
+      - name: Install dependencies
+        run: npm ci
 
       - name: Run nested action with wrapper (using time)
         uses: ./

action.yml

@@ -117,7 +117,7 @@ outputs:
   git_oid:
     description: "GitOID of the attestation (if created)"
 runs:
-  using: "node16"
+  using: "node20"
   main: "index.js"
 
 branding: