CLOUDP-293900: Fix failing Postman release job (#349)

Author: lovisaberggren

.github/workflows/release-postman.yml

@@ -22,6 +22,15 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+          cache: 'npm'
+          
+      - name: Install npm dependencies
+        run: npm install
+
       - name: Fetch OpenAPI Specification
         working-directory: ./tools/postman
         run: |