cancel in progress, limit to 4 concurrent for max of 32 cores

Author: jsirianni

.github/workflows/tests.yml

@@ -7,9 +7,10 @@ jobs:
     if: github.actor != 'dependabot[bot]'
     concurrency:
       group: unit-tests-${{ github.ref }}
+      cancel-in-progress: true
     strategy:
       fail-fast: false
-      max-parallel: 1
+      max-parallel: 4
       matrix:
         include:
           # Ubuntu - All tests