Install latest wxpython version of 4.2.2. with pip install

[bobleesj]

It appears that the latest version (4.2.2) wxpython is not available on conda-forge. https://anaconda.org/conda-forge/wxpython

while pip install downloads the latest version of 4.2.2

conda install wxpython  # installs 4.2.1.
...
pip install wxpython  # installs 4.2.2

The main motivation for this PR is that I get the following error using 4.2.1 via conda install:

mportError: dlopen(/Users/imac/miniconda3/envs/pdfgui_env/lib/python3.12/site-packages/wx/_core.cpython-312-darwin.so, 0x0002): Library not loaded: @rpath/libwx_osx_cocoau_core-3.2.0.2.3.dylib
  Referenced from: <6182F180-9097-36BA-88EB-BC2D45892BDB> /Users/imac/miniconda3/envs/pdfgui_env/lib/python3.12/site-packages/wx/_core.cpython-312-darwin.so
  Reason: tried: '/Users/imac/miniconda3/envs/pdfgui_env/lib/python3.12/site-packages/wx/../../../libwx_osx_cocoau_core-3.2.0.2.3.dylib' (no such file), '/Users/imac/miniconda3/envs/pdfgui_env/lib/python3.12/site-packages/wx/../../../libwx_osx_cocoau_core-3.2.0.2.3.dylib' (no such file), '/Users/imac/miniconda3/envs/pdfgui_env/bin/../lib/libwx_osx_cocoau_core-3.2.0.2.3.dylib' (no such file), '/Users/imac/miniconda3/envs/pdfgui_env/bin/../lib/libwx_osx_cocoau_core-3.2.0.2.3.dylib' (no such file), '/usr/local/lib/libwx_osx_cocoau_core-3.2.0.2.3.dylib' (no such file), '/usr/lib/libwx_osx_cocoau_core-3.2.0.2.3.dylib' (no such file, not in dyld cache)

while when I use 4.2.2 via pip install via .whl, it's smooth and pytest runs well for Python 3.12.

The following runs locall (macOS):

# Move wxpython to pip install
CONDA_SUBDIR=osx-64 conda create -n pdfgui_env python=3.12
conda install --file requirements/run.txt --file requirements/test.txt
pip install -r requirements/pip.txt
pip install --no-deps .
pytest

[bobleesj]

Closing this - it appears that pip install should be the last option. Let's try to first test on conda-forge pre-release.