Replace all occurrences of 's1-prod-macos-13-5-arm64' with 's1-macos-15-arm64-8'

Author: service-bot-app[bot]

.semaphore/semaphore.yml

@@ -16,7 +16,7 @@ blocks:
  task:
  agent:
  machine:
- type: s1-prod-macos-13-5-arm64
+ type: s1-macos-15-arm64-8
  prologue:
  commands:
  - sem-version go 1.21