chore(deps): pin dependency node to 20.19.4

Author: renovate[bot]

.github/workflows/npmpublish.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v4.2.1
       - uses: actions/setup-node@v4.0.4
         with:
-          node-version: 20
+          node-version: 20.19.4
       - run: npm ci
       - run: npm test
 
@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v4.2.1
       - uses: actions/setup-node@v4.0.4
         with:
-          node-version: 20
+          node-version: 20.19.4
           registry-url: https://registry.npmjs.org/
       - run: npm ci
       - run: npm publish