Bump GitHub actions versions

Author: microbit-robert

.github/workflows/build.yml

@@ -26,9 +26,9 @@ jobs:
     steps:
       # Note: This workflow will not run on forks without modification; we're open to making steps
       #       that rely on our deployment infrastructure conditional. Please open an issue.
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Configure node
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: 20.x
           cache: "npm"