Switch macos CI runner

[karliss]

Your checklist for this pull request

• [x] I've read the guidelines for contributing to this repository
• [x] I made sure to follow the project's coding style
• [ ] I've updated the documentation with the relevant information (if needed)

Detailed description

macos-latest currently is an arm64 machine so switch to macos-14-large which is supposed to be x86-64.

Since github now provide arm64 macos machines the main arm64 builds should be moved there as well. I am planning to do that together with qt6 changes.

Test plan (required)