Standalone executables do not have yaml support

[anonygit99]

When running the standalone executables, the --config-yaml ~/mygdlconfig.yaml option fails because the PyYAML module does not seem to be included in the build process.

The error shows "No module named 'yaml'" coming from the import on line 46 of __init__.py.
Tested on windows (installed with scoop) & linux (wsl, installed with brew), gallery-dl v1.25.1

In a virtual environment, I installed pyyaml and the other deps (pip install requests requests[socks] yt-dlp pyinstaller pyyaml) and built my the gallery-dl executable locally (via scripts/pyinstaller.py), which seemed to fix the error and allow yaml config files to be passed to gallery-dl.exe --config-yaml <pathtofile> at runtime.