Github now has (paid) support for M1 builders, so updated the build s…

…cript to use them and put some cash in the bucket. Seems cheap enough to just keep topped up and saves me from having to use my laptop.

.github/workflows/build.yml

@@ -304,14 +304,10 @@ jobs:
 
   # Build Apple Silicon Mac native binary.
   # See https://cmake.org/cmake/help/v3.23/variable/CMAKE_APPLE_SILICON_PROCESSOR.html
-  # Currently runs on Jason's Mac using a Github self hosted runner because Github doesn't
-  # yet support runners for Apple Silicon on macOS. 
-  # Requires that the runner machine have, at least, maven and ant installed.
   build_mac_aarch64:
     strategy:
       matrix:
         java: [18]
-    # runs-on: [self-hosted, macOS, ARM64]
     runs-on: [macos-13-xlarge]
 
     steps: