Update GH Actions jobs from Node 18 to 20.

Signed-off-by: Roland Grunberg <rgrunber@redhat.com>

Author: rgrunber

.github/workflows/pr-verify.yml

@@ -14,13 +14,13 @@ jobs:
       - name: Set Up NodeJS
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
       - name: Set Up Java
         uses: actions/setup-java@v4
         with:
           java-version: '24'
           distribution: 'temurin'
-      - run: npm install -g typescript "vsce"
+      - run: npm install -g typescript "@vscode/vsce"
       - run: wget http://download.eclipse.org/jdtls/snapshots/jdt-language-server-latest.tar.gz
       - run: mkdir server && tar -xvzf jdt-language-server-latest.tar.gz -C ./server && rm jdt-language-server-latest.tar.gz
       - run: npm install

.github/workflows/release.yml

@@ -94,7 +94,7 @@ jobs:
       - name: Set Up NodeJS
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
       - name: Install NodeJS dependencies
         run: npm install -g typescript "@vscode/vsce" "ovsx"
       - name: Download JDT-LS Release