Update GitHub Actions to run specs on Windows on all supported Rubies

Author: mvz

.github/workflows/ruby.yml

@@ -86,7 +86,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.6, 2.7, "3.0"]
+        ruby: [2.6, 2.7, "3.0", "3.1", "3.2"]
 
     runs-on: windows-latest