replace hardcoded node version with cache reference in release CI

Author: Bart Veneman

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          cache: "npm"
       - run: npm install --ignore-scripts --no-audit --no-fund
       - run: npm test
 
@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          cache: "npm"
           registry-url: https://registry.npmjs.org/
       - run: npm install --ignore-scripts --no-audit --no-fund
       - run: npm run build