[MAC] x64 target matches arm64 target (both are now 14.8), update github to use 26 like gitlab

Closes #9327

~~I am not sure if https://github.com/OpenMW/openmw-deps-build/pull/47 has to be done to do this, but I feel like it should be done as part of this MR regardless. ~~

Edited by Sarah Sunday

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