windows-2016 is deprecated and windows-2022 is now supported

* Stop testing on windows-2016 to reduce the test matrix size to something reasonable.

.github/workflows/test.yml

@@ -15,21 +15,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-18.04, ubuntu-20.04, macos-10.15, macos-11.0, windows-2016, windows-2019, windows-2022 ]
+        os: [ ubuntu-18.04, ubuntu-20.04, macos-10.15, macos-11.0, windows-2019, windows-2022 ]
         ruby: [ 1.9, '2.0', 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1, ruby-head, jruby, jruby-head, truffleruby, truffleruby-head, truffleruby+graalvm, truffleruby+graalvm-head ]
         include:
-        - { os: windows-2016, ruby: mingw }
         - { os: windows-2019, ruby: mingw }
         - { os: windows-2019, ruby: mswin }
         - { os: windows-2022, ruby: mingw }
         - { os: windows-2022, ruby: ucrt  }
         exclude:
-        - { os: windows-2016, ruby: 1.9 }
-        - { os: windows-2016, ruby: debug }
-        - { os: windows-2016, ruby: truffleruby }
-        - { os: windows-2016, ruby: truffleruby-head }
-        - { os: windows-2016, ruby: truffleruby+graalvm }
-        - { os: windows-2016, ruby: truffleruby+graalvm-head }
         - { os: windows-2019, ruby: 1.9 }
         - { os: windows-2019, ruby: debug }
         - { os: windows-2019, ruby: truffleruby }

README.md

@@ -41,7 +41,7 @@ The action works for all [GitHub-hosted runners](https://help.github.com/en/acti
 | ----------- | -------- | -------- |
 | Ubuntu  | `ubuntu-latest`  (= `ubuntu-20.04`) | `ubuntu-18.04`, `ubuntu-16.04` |
 | macOS   | `macos-latest`   (= `macos-10.15`)  | `macos-11.0` |
-| Windows | `windows-latest` (= `windows-2019`) | `windows-2016` |
+| Windows | `windows-latest` (= `windows-2019`) | `windows-2022` |
 
 The prebuilt releases are generated by [ruby-builder](https://github.com/ruby/ruby-builder)
 and on Windows by [RubyInstaller2](https://github.com/oneclick/rubyinstaller2).