change to ARM macOS Semaphore agent (#1456)

Author: cchristous

.semaphore/semaphore.yml

@@ -16,7 +16,7 @@ blocks:
     task:
       agent:
         machine:
-          type: s1-prod-macos-13-5-amd64
+          type: s1-prod-macos-13-5-arm64
       prologue:
         commands:
           - sem-version go 1.21