CI: drop Node 16, add Node 22, refresh action versions

Node 16 fails because eslint 8 / typescript-eslint 8 needs the
structuredClone global (Node 17+), and the html-to-structured-text
package now declares engines.node >=18 anyway. Also bump checkout
and setup-node to v4.

Author: stefanoverna

.github/workflows/node.js.yml

@@ -15,13 +15,13 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [18.x, 20.x, 22.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm ci