Add vte3 to dependencies on mac

[gavr123456789]

Readme says

macos
brew install gtk4 gtksourceview5 pkg-config

It should be

brew install gtk4 gtksourceview5 pkg-config vte3

Other vice it will be a build error

.cache/nim/bona_d/@mbona.nim.c.o  -framework Security Package vte-2.91-gtk4 was not found in the pkg-config search path.
Perhaps you should add the directory containing `vte-2.91-gtk4.pc'
to the PKG_CONFIG_PATH environment variable
Package 'vte-2.91-gtk4' not found   -ldl'
stack trace: (most recent call last)
/private/var/folders/3r/45tcx_0j7n1cjnd0hrq6lblr0000gn/T/nimblecache-303588642718418816/nimscriptapi_3978026296029586313.nim(219, 16)
/Users/.../Nim/harding/harding.nimble(287, 3) bonaTask
/opt/homebrew/Cellar/nim/2.2.10/nim/lib/system/nimscript.nim(264, 7) exec
/opt/homebrew/Cellar/nim/2.2.10/nim/lib/system/nimscript.nim(264, 7) Error: unhandled exception: FAILED: nim c -p:external  -d:gtk4 -d:granite  -o:bona src/harding/gui/bona.nim [OSError]