Add Apple Silicon builds to artifacts

This was specifically excluded by Keith in the past, but it looks like they may be working now.
I'm going to include them and see if we can get some beta testers.

.github/workflows/artifacts_build.yml

@@ -52,9 +52,16 @@ jobs:
           # Windows - both 64-bit and 32-bit builds
           CIBW_ARCHS_WINDOWS: "AMD64 x86"
 
-          # macOS - just Intel build (ARM doesn't work); no bundled libraries
+          # macOS
+          #
+          # At the time of this writing, Github actions still do not support ARM macs - all
+          # runners are Intel.  You can cross-compile on Intel to ARM, however, which is good
+          # enough us.
+          #
           # https://cibuildwheel.readthedocs.io/en/stable/faq/#how-to-cross-compile
-          CIBW_ARCHS_MACOS: x86_64
+
+          CIBW_ARCHS_MACOS: x86_64 arm64
+
           # prevent the addition of unixODBC dylibs to the wheel by simply not calling the repair
           CIBW_REPAIR_WHEEL_COMMAND_MACOS: ""