Switch CI to Intel-based Mac runner #202
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MOPAC is presently being distributed for Intel-based Macs, although it supports ARM-based Macs through conda forge. The default GHA Runners recently switched to ARM processors on Mac, which broke the CI. A bit surprisingly, the Intel Fortran compiler is working just fine on ARM (presumably through the Rosetta-based Intel emulation) and presumably produces an Intel binary that is also running through emulation. While everything seems fine, I'm going to switch to an Intel-based Mac Runner, just to avoid any possible cross-compilation issues. Eventually, the Mac distribution will switch to either ARM-native binaries or universal binaries that run on both ARM and Intel, if that is ever possible with Fortran-based software.
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