Remove pip steps that should be unnecessary

.travis.yml

@@ -131,12 +131,7 @@ jobs:
       name: Python 3.9 on Windows
       before_install:
         - choco install python --pre
-        - ls /c/
-        #- C:/ProgramData/chocolatey/bin/python --version # this doesn't work - it's Python 2.7
         - python --version
-        - curl -o get-pip.py https://bootstrap.pypa.io/get-pip.py
-        - python get-pip.py
-        - rm get-pip.py
         - pip --version
         - pip install toml
         - python .build/allow_all_python_version.py