chore: update Node.js version to 20 and install latest npm in workflow (#33)

Author: vadyvas

.github/workflows/publish.yml

@@ -14,7 +14,8 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
+      - run: npm install -g npm@latest
       - run: npm install
       - run: git submodule update --init
       - run: npm run test-ci