Remove unneeded dependency python3-pip

[stweil]

Signed-off-by: Stefan Weil sw@weilnetz.de

[kba]

We probably even only need python3-venv because it implies python3 doesn't it?

[stweil]

That's right, but the superfluous python3 won't cause installation of unneeded software (while python3-pip would, about 3 MB).

[bertsky]

Wait, can you show me proof / documentation that's true? (I often see the case that pip or pip3 in a venv points to the preinstalled version from the host system, not the venv.)

[stweil]

I haven't installed python3-pip on any of our systems where I have built OCR-D (Linux, macOS, Debian, Ubuntu, x86_64, arm, aarch64, Python 3.6, 3.7, 3.8, 3.9). pip or pip3 in the virtual environment is always a small script with less than 300 bytes .