Update get-pipenv.py

[oz123]

Fix #6259

[a94763075]

python: 3.9.13

jobs:
  build:

    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
      - name: Set up Python 3.x
        uses: actions/setup-python@v4
        with:
          python-version: "3.9"
          cache: "pipenv"
      - name: Install pipenv
        run: curl https://raw.githubusercontent.com/pypa/pipenv/master/get-pipenv.py | python

Failed install pipenv after this branch merged

[oz123]

@a94763075 fixed in a2ed936.