Github actions:

* Use macos-latest runner to build arm64 and macos-latest-large runner to build x86_64, as the github macos-latest runner now appears to correspond arm64 / M1 architecture.

Author: mikeov

.github/workflows/build.yml

@@ -140,7 +140,7 @@ jobs:
         run: aws s3 cp build/qfs-*.tgz s3://quantcast-qfs
 
   osx-build:
-    runs-on: macos-latest
+    runs-on: macos-latest-large
     env:
       BUILD_OS_NAME: osx
     steps:
@@ -168,7 +168,7 @@ jobs:
         run: aws s3 cp build/qfs-*.tgz s3://quantcast-qfs
 
   osx-build-arm64:
-    runs-on: macos-latest-xlarge
+    runs-on: macos-latest
     env:
       BUILD_OS_NAME: osx
     steps: