Update MacOS arm jobs in ci to MacOS 26#728

mcbarton wants to merge 3 commits intocompiler-research:maincompiler-research/CppInterOp:mainfrom

mcbarton:Update-MacOS-arm-jobs-to-MacOS-26-cimcbarton/CppInterOp:Update-MacOS-arm-jobs-to-MacOS-26-ciCopy head branch name to clipboard