macOS 15 runner is available

[Joshua Root]

> On Mon, Sep 30, 2024, at 7:51 PM, Ryan Carsten Schmidt wrote:
>> > On Sep 30, 2024, at 18:47, Mark E Anderson wrote:
>> >
>> > Github seems to have a macOS 15 runner in beta, which might help out 
>> on our quest to squash macOS 15 bugs. Although, I have noticed the CI 
>> can be a little fickle when doing something big like qt.
>>
>> I haven't set up the macOS 15 arm64 buildbot machine yet. That means 
>> CI would have to build not just the port being changed but also all of 
>> its dependencies which could exceed the allotted build time and make 
>> scarce CI resources unavailable to others.

It may still be helpful to enable the runner on personal forks when 
trying out changes to ports without too many dependencies.

- Josh