Test on more ruby versions

…and fix 3.1.4 -> 3.4.1 typo.

Author: ramhoj

.github/workflows/ruby.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        ruby-version: ["2.6", "2.7", "3.0", "3.1.4"]
+        ruby-version: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4"]
 
     steps:
     - uses: actions/checkout@v4