Update matrix job configuration to ensure maximum parallel execution

Author: Albejr

.github/workflows/12-0-matrix.yaml

@@ -12,6 +12,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         node: [14, 16, 18]
+      max-parallel: 3
     steps:
       - name: Matrix Job Step 1
         run: |