Bump from Node 18 to 20 for PR verification.

Signed-off-by: Roland Grunberg <[email protected]>

Author: rgrunber

.github/workflows/tests.yml

@@ -23,7 +23,7 @@ jobs:
         uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
       - name: Install vsce
         run: npm i -g @vscode/vsce
       - name: Install dependencies