setup: use old importlib_metadata version to fix kombu failing on python < 3.8

Many libraries use the importlib_metadata library as fallback when running on
Python versions older than 3.8 . For example setuptools when easy_install is
used for install the Kallithea console_scripts entrypoints in the bin folder.
The dependencies on importlib_metadata were indirect and without constrains on
version number.

The problem is that Celery uses Kombu, which (on Python < 3.8) uses
importlib_metadata in a way that is incompatible with importlib_metadata > 5.

Most obvious, building docs failed as:
  Running Sphinx v5.1.1

  Configuration error:
  There is a programmable error in your configuration file:

  Traceback (most recent call last):
    File ".../kallithea/venv/lib64/python3.7/site-packages/sphinx/config.py", line 347, in eval_config_file
      exec(code, namespace)
    File ".../kallithea/docs/conf.py", line 17, in <module>
      import kallithea
    File ".../kallithea/kallithea/__init__.py", line 45, in <module>
      CELERY_APP = celery.Celery()  # needed at import time but is lazy and can be configured later
    File ".../kallithea/venv/lib64/python3.7/site-packages/celery/local.py", line 492, in __getattr__
      [name])
    File ".../kallithea/venv/lib64/python3.7/site-packages/celery/app/__init__.py", line 2, in <module>
      from celery import _state
    File ".../kallithea/venv/lib64/python3.7/site-packages/celery/_state.py", line 15, in <module>
      from celery.utils.threads import LocalStack
    File ".../kallithea/venv/lib64/python3.7/site-packages/celery/utils/__init__.py", line 16, in <module>
      from .nodenames import nodename, nodesplit, worker_direct
    File ".../kallithea/venv/lib64/python3.7/site-packages/celery/utils/nodenames.py", line 6, in <module>
      from kombu.entity import Exchange, Queue
    File ".../kallithea/venv/lib64/python3.7/site-packages/kombu/entity.py", line 7, in <module>
      from .serialization import prepare_accept_content
    File ".../kallithea/venv/lib64/python3.7/site-packages/kombu/serialization.py", line 440, in <module>
      for ep, args in entrypoints('kombu.serializers'):  # pragma: no cover
    File ".../kallithea/venv/lib64/python3.7/site-packages/kombu/utils/compat.py", line 82, in entrypoints
      for ep in importlib_metadata.entry_points().get(namespace, [])
  AttributeError: 'EntryPoints' object has no attribute 'get'

That made readthedocs builds fail, when it in the default web configuration
used Python 3.7 .

Fixed by introducing an explicit dependency on importlib_metadata < 5.

setup.py

@@ -75,6 +75,8 b' requirements = ['
     "pip >= 20.0, < 999",
     "chardet >= 3",
 ]
+if sys.version_info < (3, 8):
+    requirements.append("importlib-metadata < 5")
 
 dependency_links = [
 ]