Bump ci.yml to include ruby 3.3, singularize macos, and clean up depr…

…ecations on the checkout action (should I remove the version?!? so annoying)

[git-p4: depot-paths = "//src/minitest/dev/": change = 14082]

.github/workflows/ci.yml

@@ -1,6 +1,8 @@
 ---
 name: CI
 
+# https://github.com/actions/checkout
+# https://github.com/ruby/setup-ruby
 # https://github.com/actions/virtual-environments#available-environments
 # https://github.com/ruby/setup-ruby/blob/master/README.md#supported-platforms
 
@@ -18,22 +20,22 @@ jobs:
  strategy:
  fail-fast: false
  matrix:
- os:
- - ubuntu-latest
- - macos-latest
  ruby:
  - '2.7'
  - '3.0'
  - '3.1'
  - '3.2'
+ - '3.3'
  - head
  include:
  - os: windows-latest
  ruby: ruby
+ - os: macos-latest
+ ruby: ruby
 
  steps:
  - name: repo checkout
- uses: actions/checkout@v3
+ uses: actions/checkout@v4
 
  - name: load ruby
  uses: ruby/setup-ruby@v1
@@ -59,7 +61,7 @@ jobs:
  || contains(github.event.pull_request.title, '[skip ci]'))
  steps:
  - name: repo checkout
- uses: actions/checkout@v3
+ uses: actions/checkout@v4
 
  - name: load ruby
  uses: ruby/setup-ruby@v1