Upgrading pip via ensurepip unfortunately doesn't do anything wealthy.

```bash
user@host MINGW64 ~
$ pip list | grep pip
pip                       21.2.3
WARNING: You are using pip version 21.2.3; however, version 21.2.4 is available.
You should consider upgrading via the 'C:\Python39\python.exe -m pip install --upgrade pip' command.

user@host MINGW64 ~
$ py -m ensurepip --upgrade
Looking in links: c:\Users\BATERF~1\AppData\Local\Temp\tmpuv4go5fy
Requirement already satisfied: setuptools in c:\python39\lib\site-packages (57.4.0)
Requirement already satisfied: pip in c:\python39\lib\site-packages (21.2.3)

user@host MINGW64 ~
$ pip list | grep pip
pip                       21.2.3
WARNING: You are using pip version 21.2.3; however, version 21.2.4 is available.
You should consider upgrading via the 'C:\Python39\python.exe -m pip install --upgrade pip' command.
```