Remove pkg_resources import from setup.py

[pacesm]

Remove pkg_resources import from setup.py:

eoxserver/setup.py

Lines 3 to 11 in 742d08b

	import pkg_resources
	with open('requirements.txt', 'r') as reqs:
	install_requires = [
	str(requirement)
	for requirement
	in pkg_resources.parse_requirements(reqs)
	]

It breaks installation with newer Python and newer setuptools versions.

Python 3.12 has removed pkg_resources from the standard library and moved it to setuptools (https://docs.python.org/3/whatsnew/3.12.html)

The latest setuptools v82.0.0 removed pkg_resources (https://setuptools.pypa.io/en/stable/history.html#v82-0-0).

Proposed solution: just read the requirements.txt lines into a list of strings and let setuptools do the parsing.