a weird exception is raised during test setup, in the vendored certifi
from pip:

  Traceback (most recent call last):
    File "/usr/local/lib/python3.10/runpy.py", line 197, in _run_module_as_main
      return _run_code(code, main_globals, None,
    File "/usr/local/lib/python3.10/runpy.py", line 87, in _run_code
      exec(code, run_globals)
    File "/usr/local/lib/python3.10/site-packages/pip/__main__.py", line 26, in <module>
      sys.exit(_main())
    File "/usr/local/lib/python3.10/site-packages/pip/_internal/cli/main.py", line 73, in main
      command = create_command(cmd_name, isolated=("--isolated" in cmd_args))
    File "/usr/local/lib/python3.10/site-packages/pip/_internal/commands/__init__.py", line 105, in create_command
      module = importlib.import_module(module_path)
    File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "<frozen importlib._bootstrap>", line 1049, in _gcd_import
    File "<frozen importlib._bootstrap>", line 1026, in _find_and_load
    File "<frozen importlib._bootstrap>", line 1005, in _find_and_load_unlocked
    File "<frozen importlib._bootstrap>", line 698, in _load_unlocked
    File "<frozen importlib._bootstrap_external>", line 833, in exec_module
    File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
    File "/usr/local/lib/python3.10/site-packages/pip/_internal/commands/install.py", line 17, in <module>
      from pip._internal.cli.req_command import RequirementCommand, with_cleanup
    File "/usr/local/lib/python3.10/site-packages/pip/_internal/cli/req_command.py", line 18, in <module>
      from pip._internal.index.collector import LinkCollector
    File "/usr/local/lib/python3.10/site-packages/pip/_internal/index/collector.py", line 14, in <module>
      from pip._vendor import html5lib, requests
    File "/usr/local/lib/python3.10/site-packages/pip/_vendor/requests/__init__.py", line 125, in <module>
      from . import utils
    File "/usr/local/lib/python3.10/site-packages/pip/_vendor/requests/utils.py", line 40, in <module>
      DEFAULT_CA_BUNDLE_PATH = certs.where()
    File "/usr/local/lib/python3.10/site-packages/pip/_vendor/certifi/core.py", line 37, in where
      _CACERT_PATH = str(_CACERT_CTX.__enter__())
  AttributeError: 'PosixPath' object has no attribute '__enter__'

# Conflicts:
#	.ci/.jenkins_exclude.yml
#	.ci/.jenkins_python.yml

This is especially problematic when mounting the working directory
in docker for testing, as the local Python version may differ from
the one in docker.

…thon 3.4

also, removed a bunch of outdated excludes