removed max-parallel

Author: moward98

.github/workflows/validate.yml

@@ -20,7 +20,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         python-version: ["3.9", "3.10", "3.11", "3.12"]
-      max-parallel: 1
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3