GHA MacOS linking fails due to xcode 14.0 bug

Example at https://github.com/UCL/STIR/actions/runs/3481477959/jobs/5822620660#step:7:43
```
Assertion failed: (_file->_atomsArrayCount == computedAtomCount && "more atoms allocated than expected"),
```
Known problem, probably resolved with XCode 14.1, see e.g.
https://stackoverflow.com/questions/73714336/xcode-update-to-version-2395-ld-compile-problem-occurs-computedatomcount-m