Change macOS arch to “universal” in github actions

[evgenykochetkov]

A tiny tweak that allows building a binary that runs natively on both Apple silicon and Intel-based Macs.

file ./addons/PathMesh3D/bin/*.dylib
./addons/PathMesh3D/bin/libpath_mesh_3d.macos.template_debug.dylib:   Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit dynamically linked shared library x86_64] [arm64:Mach-O 64-bit dynamically linked shared library arm64]
./addons/PathMesh3D/bin/libpath_mesh_3d.macos.template_debug.dylib (for architecture x86_64):	Mach-O 64-bit dynamically linked shared library x86_64
./addons/PathMesh3D/bin/libpath_mesh_3d.macos.template_debug.dylib (for architecture arm64):	Mach-O 64-bit dynamically linked shared library arm64
./addons/PathMesh3D/bin/libpath_mesh_3d.macos.template_release.dylib: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit dynamically linked shared library x86_64] [arm64:Mach-O 64-bit dynamically linked shared library arm64]
./addons/PathMesh3D/bin/libpath_mesh_3d.macos.template_release.dylib (for architecture x86_64):	Mach-O 64-bit dynamically linked shared library x86_64
./addons/PathMesh3D/bin/libpath_mesh_3d.macos.template_release.dylib (for architecture arm64):	Mach-O 64-bit dynamically linked shared library arm64

Here is a link to a manually triggered build to prove that it properly works: https://github.com/evgenykochetkov/PathMesh3D/actions/runs/20071087951/job/57573746112#step:7:9

Also, you may need to point the users to this page: https://docs.godotengine.org/en/stable/tutorials/export/running_on_macos.html#app-is-not-signed-executable-is-linker-signed

Basically, to get rid of this error

the user may need to run

xattr -dr com.apple.quarantine ./addons/PathMesh3D/bin/*.dylib

from the project root.

[iiMidknightii]

Ahh mac is new to me, thanks for all this help. Merging as it looks good.