Use newer Qt version on macOS

[cbjeukendrup]

Resolves: #16533
Resolves: #17740

[bkunda]

I've been able to verify that the spaces are now working as they are supposed to. So glad this has been fixed!
I was unfortunately unable to verify whether #17740 has been properly fixed by this (as far as I can tell, the behaviour in this build is the same as in the latest nightly). Perhaps @bakajikara can verify?

[bakajikara]

@bkunda Yes, I've rechecked the build now and it's working as expected!
(The behavior depends on macOS's preferred language setting; if both Japanese and Korean are not on the list, it will use Chinese glyphs as default.)

[bkunda]

ok great!
Then @cbjeukendrup I think we may be ready to go with this one!