OSX related issues

[butuzov]

Some issues i did run into while trying to package macosx app.

Versions

• Python: 3.11
• OS: MacOS Ventura (13.6)
• Buildozer: master

Reproduce

git clone https://github.com/HusamFathi/KivyMD-Dashboard-UI
cd KivyMD-Dashboard-UI
python3 -m venv .venv
. .venv/bin/activate
pip install kivymd
https://github.com/kivy/buildozer
python setup.py build
pip install -e .
buildozer init
buildozer -v  osx release

This PR https://github.com/kivy/buildozer/pull/1719 aims to fix at least three of build issues:

• Failed to download first Kivy.dmg (and them osx package itself)
• Trying to copy one files instead of folder (mac apps are fodlers)
• adding requirements.txt from osx packager