Revert "[test] override node version of checkout"

This reverts commit 33ad792.

Author: davegarthsimpson

.github/workflows/build.yml

@@ -312,8 +312,6 @@ jobs:
         # actions/checkout@v4 has dependency on a higher version of glibc than available in the Linux container.
         if: fromJSON(matrix.config.container) != null
         uses: actions/checkout@v3
-        env:
-          ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
 
       - name: Install Node.js
         if: fromJSON(matrix.config.container) == null && runner.os != 'Windows'