Attempt to fix crash on macOS 11 by using Xcode 15.4

[Noisyfox]

Fixes #5934

Source:
https://forums.developer.apple.com/forums/thread/736203

[ElectricalBoy]

FYI: actions/runner-images#10121

[Noisyfox]

FYI: actions/runner-images#10121

Yeah I know, I made this PR just so that people with macos 11 could help testing if this really works.

[RockChewer3D]

@Noisyfox is there a way to make the change in layman's terms? When I tried it it kept coming back as invalid developer directory. Thanks for all your help

[Noisyfox]

@Noisyfox is there a way to make the change in layman's terms? When I tried it it kept coming back as invalid developer directory. Thanks for all your help

Do you have a more detailed build log? And what command did you run?

[RockChewer3D]

@Noisyfox is there a way to make the change in layman's terms? When I tried it it kept coming back as invalid developer directory. Thanks for all your help

Do you have a more detailed build log? And what command did you run?

@Noisyfox - I followed the breadcrumbs for 2.1.1 and was able to get the "...X86_64_PR-2002.dmg" file to load from the following link you posted: https://github.com/SoftFever/OrcaSlicer/actions/runs/9775636085 - Thanks a million and I appreciate the response!

[dderbidge]

X86_64_PR_2002.dmg also worked on my MacBook Pro Late-2013 Retina using macOS 11.7.10. Thanks! I'm happy to receive the same hotfixes that new computers also got for now. Thanks, @Noisyfox

[fludstank]

Working well on 11.6 here - no crash on startup.
Thank you @Noisyfox

[jorgesantos]

v2.1.1 working on Bigsur 11.17.10 intel mac, big thank you @Noisyfox

[SoftFever]

Thank you for looking into this issue!
As planned, 15.4 is now the default version.
So closing this PR.