Build: Fix GitHub's own self-induced deprecation warnings

Because Microsoft requires 5 docker containers, 300 npm packages,
TypeScript, and a Node.js process to run "git checkout". And even then,
it isn't a built-in but something customers individually upgrade,
to address the left-hand deprecating Node.js affecting the right-hand
"checkout" action.

Ref jquery/typesense-minibar@250e633211.
Ref Krinkle/example-node-and-browser-qunit-ci@c15cead883.
Ref qunitjs/qunit@f94f5a642e.
Ref jquery/jquery-wp-content@97383a5914.

.github/workflows/test.yml

@@ -25,12 +25,12 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           persist-credentials: false
 
       - name: Set up Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node }}