Test suite failing due to setuptools/pip updates

[freakboy3742]

Describe the bug

The Briefcase CI test suite is currently failing with a series of errors caused by recent setuptools and pip updates,.

Steps to reproduce

1. Update pip and setuptools
2. Run the CI test suite.

Expected behavior

Test suite should pass cleanly,

Screenshots

No response

Environment

• Operating System: macOS (any)
• Python version: any
• Software versions:
  • Briefcase: 0.3.15.dev29+g5c83de4a
  • Pip: 23.1
  • Setuptools: 67.6.1

Logs

There are dozens of test failures, preventing CI from even collecting the test suite:

==============================================================================
CRITICAL: tests/test_cmdline.py
------------------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/rkm/beeware/briefcase/tests/test_cmdline.py", line 16, in <module>
    from briefcase.platforms.macOS.app import (
  File "/Users/rkm/beeware/briefcase/src/briefcase/platforms/macOS/__init__.py", line 20, in <module>
    import dmgbuild
  File "/Users/rkm/beeware/briefcase/venv3.10/lib/python3.10/site-packages/dmgbuild/__init__.py", line 1, in <module>
    from .core import build_dmg
  File "/Users/rkm/beeware/briefcase/venv3.10/lib/python3.10/site-packages/dmgbuild/core.py", line 12, in <module>
    import pkg_resources
  File "/Users/rkm/beeware/briefcase/venv3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 121, in <module>
    warnings.warn("pkg_resources is deprecated as an API", DeprecationWarning)
DeprecationWarning: pkg_resources is deprecated as an API

Additional context

The issue is that dmgbuild is using the deprecated setuptools pkg_resources API to get package resources.

[freakboy3742]

See dmgbuild/dmgbuild#59.

[freakboy3742]

dmgbuild 1.6.1 has been released, fixing the originally reported issue.

This has now revealed an issue with the window winstore environment build in CI:

Run tox -e py --installpkg dist/briefcase-*.whl
[2](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:2)
  tox -e py --installpkg dist/briefcase-*.whl
[3](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:3)
  shell: C:\Program Files\Git\bin\bash.EXE --noprofile --norc -e -o pipefail {0}
[4](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:4)
  env:
[5](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:5)
    MSYS: winsymlinks:nativestrict
[6](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:7)
.pkg_external: freeze> python -m pip freeze --all
[7](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:8)
.pkg_external: 
[8](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:9)
py: install_package_deps> python -I -m pip install GitPython<4.0,>=3.1 build>=0.10 cookiecutter<3.0,>=2.1 coverage[toml]==7.2.3 "dmgbuild<2.0,>=1.6; sys_platform == \"darwin\"" "importlib-metadata>=4.4; python_version <= \"3.9\"" packaging>=22.0 pip>=22 platformdirs<4.0,>=2.6 pre-commit==3.2.2 psutil<6.0,>=5.9 pytest-tldr==0.2.5 pytest==7.3.1 requests<3.0,>=2.28 rich<14.0,>=12.6 setuptools-scm[toml]==7.1.0 setuptools>=60 tomli-w<2.0,>=1.0 "tomli<3.0,>=2.0; python_version <= \"3.10\"" tox==4.4.12 wheel>=0.37
[9](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:10)
ERROR: Can not perform a '--user' install. User site-packages are not visible in this virtualenv.
[10](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:11)

[11](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:12)
py: exit 1 (1.94 seconds) D:\a\briefcase\briefcase> python -I -m pip install GitPython<4.0,>=3.1 build>=0.10 cookiecutter<3.0,>=2.1 coverage[toml]==7.2.3 "dmgbuild<2.0,>=1.6; sys_platform == \"darwin\"" "importlib-metadata>=4.4; python_version <= \"3.9\"" packaging>=22.0 pip>=22 platformdirs<4.0,>=2.6 pre-commit==3.2.2 psutil<6.0,>=5.9 pytest-tldr==0.2.5 pytest==7.3.1 requests<3.0,>=2.28 rich<14.0,>=12.6 setuptools-scm[toml]==7.1.0 setuptools>=60 tomli-w<2.0,>=1.0 "tomli<3.0,>=2.0; python_version <= \"3.10\"" tox==4.4.12 wheel>=0.37 pid=4192
[12](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:13)
  py: FAIL code 1 (9.97 seconds)
[13](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:14)
  evaluation failed :( (10.14 seconds)
[14](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:15)

[15](https://github.com/beeware/briefcase/actions/runs/4748383096/jobs/8447175749?pr=1183#step:7:16)
Error: Process completed with exit code 1.

[freakboy3742]

The windows error appears to be due to a bug in pip 23.1.

[freakboy3742]

We've fixed the problem with #1196; however, that PR includes a FIXME line that can be removed once pip pushes out an updated release.