Commits on Dec 11, 2023

1. ENH: Disable pip version check …

   This commit addresses the quarterly update cycle of python packages bundled into Slicer.
   To mitigate unnecessary console clutter caused by the pip version check, the variable
   `PIP_DISABLE_PIP_VERSION_CHECK` is set, suppressing warnings such as:
   
   ```bash
   $ PythonSlicer -m pip list
   [...]
   [notice] A new release of pip is available: X.Y.Z -> Z'.Y'.Z'
   [notice] To update, run: pip install --upgrade pip
   ```
   
   To ensure that `the PIP_DISABLE_PIP_VERSION_CHECK` environment variable is
   undefined when Slicer is built against a system or external Python installation,
   this variable is set only in the pip external project.
   
   This also addresses an issue introduced in 028fb31 (COMP: Update python packages
   to latest) where the pip version was updated from `23.1.2` to `23.3`. This resulted
   in the following warning message instead of the expected update notification:
   
   ```bash
   WARNING: There was an error checking the latest version of pip.
   ```
   
   For additional details about `PIP_DISABLE_PIP_VERSION_CHECK`:
   * https://pip.pypa.io/en/stable/cli/pip/#cmdoption-disable-pip-version-check
   * https://pip.pypa.io/en/stable/topics/configuration/#environment-variables
   
   (cherry picked from commit 2cf6f14)

   

   jcfr committed Dec 11, 2023
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