Unpin pip

[dakinggg]

Remove pins for pip and setuptools in Dockerfile and setup.py.

Previous related issues:

• pip was pinned because at some point in time pip 23 made installing from source not work. that seems to have been resolved, as I was able to install from source with the latest version of pip
• EDIT: nevermind, setuptools pin is still needed to install flash attention.

Tested installing composer from source on:
2.1.2 + cpu image: try-it-cpu-2-1-2-3-V6m0Dz
2.1.2 + gpu image: try-it-gpu-2-1-2-3-BBle1N
2.2.2 + cpu image: try-it-cpu-2-2-2-3-tRu97O
2.2.2 + gpu image: try-it-gpu-2-2-2-3-sGaSyf
2.3.1 + cpu image: try-it-cpu-2-3-1-3-e5Dv41
2.3.1 + gpu image: try-it-gpu-2-3-1-3-pnHpZo

[mvpatel2000]

LGTM