Add ruby 3.2 to the CI pipeline

Author: Mateusz Drewniak

.github/workflows/ci_ruby.yml

@@ -20,7 +20,7 @@ jobs:
       CI: true
     strategy:
       matrix:
-        ruby-version: ['2.7', '3.0', '3.1']
+        ruby-version: ['2.7', '3.0', '3.1', '3.2']
     steps:
       - name: Checkout code
         uses: actions/checkout@v3

.ruby-version

@@ -0,0 +1 @@
+3.1.3