Update ruby versions

Author: nobu

.github/workflows/ubuntu.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ 'jruby-9.2.9.0', 'ruby-head', '2.6', '2.5', '2.4' ]
+        ruby: [ 'jruby-head', 'jruby-9.3', 'jruby-9.2', 'ruby-head', '3.0', '2.7', '2.6', '2.5', '2.4' ]
     steps:
     - uses: actions/checkout@master
     - name: Set up Ruby

.github/workflows/windows.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        ruby: [ '2.6.x', '2.5.x', '2.4.x' ]
+        ruby: [ 'ruby-head', '3.0', '2.7', '2.6', '2.5', '2.4' ]
     steps:
     - uses: actions/checkout@master
     - name: Set up Ruby