chore: update workflow (#99)

Author: mlmoravek

.github/workflows/publish.yml

@@ -9,7 +9,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: '14.x'
+          node-version: '20.x'
           registry-url: 'https://registry.npmjs.org'
       - run: npm install
       - run: npm run build:lib