Test on ubuntu-22.04

Author: eregon

.github/workflows/test.yml

@@ -17,13 +17,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-18.04, ubuntu-20.04, macos-10.15, macos-11, macos-12, windows-2019, windows-2022 ]
+        os: [ ubuntu-18.04, ubuntu-20.04, ubuntu-22.04, macos-10.15, macos-11, macos-12, 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: ubuntu-22.04, ruby: '3.1.0' }
-        - { os: ubuntu-22.04, ruby: '3.1' }
-        - { os: ubuntu-22.04, ruby: '3.2.0-preview1' }
-        - { os: ubuntu-22.04, ruby: ruby-head }
         - { os: windows-2019, ruby: mingw }
         - { os: windows-2019, ruby: mswin }
         - { os: windows-2022, ruby: mingw }