darwin: Bump MAXOSX_DEPLOYMENT_TARGET to 10.13
This bumps the minumum supported version to 10.13 (High Sierra) which is 6 years old at this point.
Fixes #22938 (closed)
This bumps the minumum supported version to 10.13 (High Sierra) which is 6 years old at this point.
Fixes #22938 (closed)