Fix build issues for masOS Sonoma 14.4

[cailafinn]

The latest macOS update seems to have moved AuthorizationRef, so add the extra include to allow it to build properly.

There is no associated issue.

To test:

1. This might need testing by the ILL on macOS to ensure that the proxy still performs as expected.

This does not require release notes because it only fixes a build issue and should not be user-facing.

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[perenon]

Hi Caila.
Thank you for paying close attention to potential issue with ILL :-) .

As discussed with Sarah on Slack, my opinion would be to merge it if you were able to test on your side.

Regards,
Remi

[SilkeSchomann]

I have built Mantid successfully from this branch and tested that Mantid Workbench is still behaving normally. To check that authorisation still works, I've run the example script for ISISJournalGetExperimentRuns from the documentation and it worked fine.