After installed ArcGIS Pro 3.3, Python package certifi_win32 is missing in C:\Program Files\ArcGIS\Pro\bin\Python\envs\arcgispro-py3\Lib\site-packages.
You will find that with the latest version many packages that were present at 3.1 and 3.2 are missing. This is because nested dependencies are not supporting the version ESRI validated for release so they are not accessible.
