That helped me on the way, thanks. But entering that exact command would not install scipy in my Blender’s site-packages, but rather this folder:
C:\Users\ME\AppData\Roaming\Python\Python39\site-packages\scipy\
… so I had to change the command and add the correct target:
cd C:\Program Files\Blender Foundation\Blender 2.93\2.93\python\lib\site-packages
python -m pip install --no-deps scipy -t "C:\Program Files\Blender Foundation\Blender 2.93\2.93\python\lib\site-packages"
Now scipy is finally available for me in Blender 2.93, so I’m happy!