remove ci job max-parallel

Author: lihsai0

.github/workflows/test-ci.yml

@@ -6,7 +6,6 @@ jobs:
   build:
     strategy:
       fail-fast: false
-      max-parallel: 1
       matrix:
         php-versions: ['5.3', '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2']
     runs-on: ubuntu-latest