ci: explicitly switch macos build to silicon and upgrade xcode (#1720)

* ci: explicitly switch macos build to silicon and upgrade xcode

https://discuss.circleci.com/t/macos-resource-deprecation-update/46891

* ci: install go for arm64 on apple silicon

* ci: install go via orb on apple silicon

.circleci/config.yml

@@ -1,5 +1,6 @@
 version: 2.1
 orbs:
+  golang: circleci/[email protected]
   go: gotest/[email protected]
 
 executors:
@@ -145,18 +146,15 @@ jobs:
   build-macos:
     description: build darwin boost binary
     macos:
-      xcode: "12.5.1"
+      xcode: "15.0.0"
     working_directory: ~/go/src/github.com/filecoin-project/boost
     resource_class: macos.x86.medium.gen2
     steps:
       - prepare:
           linux: false
           darwin: true
-      - run:
-          name: Install go
-          command: |
-            curl -O https://dl.google.com/go/go1.19.5.darwin-amd64.pkg && \
-            sudo installer -pkg go1.19.5.darwin-amd64.pkg -target /
+      - golang/install:
+          version: "1.19.5"
       - run:
           name: Install pkg-config
           command: HOMEBREW_NO_AUTO_UPDATE=1 brew install pkg-config