Move GitHub Action concurrency to the root rather than per job

Author: thebrandonallen

.github/workflows/phpunit-tests.yml

@@ -10,6 +10,11 @@ on:
   pull_request:
     branches: [ develop ]
 
+# Cancel any in-progress runs of a workflow/branch if a new run is triggered,
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   # This workflow contains a single job called "build"
@@ -34,9 +39,6 @@ jobs:
       WP_ENV_PHP_VERSION: ${{ matrix.php }}
       WP_VERSION: ${{ matrix.wp_version }}
       WP_PHPUNIT_DEFAULT_VERSION: '6.6'
-    concurrency:
-      group: ${{ github.workflow }}-${{ github.ref }}
-      cancel-in-progress: true
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       - name: Checkout repository