Use m1 macs

.github/workflows/ci.yml

@@ -1,25 +1,25 @@
 name: CI
 on:
   push:
-    branches: ['main']
+    branches: ["main"]
   pull_request:
-    branches: ['main']
+    branches: ["main"]
 jobs:
   tests:
     strategy:
       fail-fast: false
       matrix:
-        os: ['ubuntu-latest', 'macos-latest']
+        os: ["ubuntu-latest", "macos-14"]
         ruby-version:
-          - '2.7'
-          - '3.0'
-          - '3.1'
-          - '3.2'
-          - 'head'
+          - "2.7"
+          - "3.0"
+          - "3.1"
+          - "3.2"
+          - "head"
 
-          - 'truffleruby-22.2'
-          - 'truffleruby-22.3'
-          - 'truffleruby-head'
+          - "truffleruby-22.2"
+          - "truffleruby-22.3"
+          - "truffleruby-head"
 
           # - 'jruby-9.4.0.0'
           # - 'jruby-head'
@@ -41,14 +41,14 @@ jobs:
         run: bundle exec sus
 
   rubocop:
-    runs-on: 'ubuntu-latest'
+    runs-on: "ubuntu-latest"
     steps:
       - uses: actions/checkout@v4
 
       - name: Setup
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.1'
+          ruby-version: "3.1"
           bundler-cache: false
 
       - name: Install dependencies