Update Ruby 3.5 -> 4.0

Author: ppostma

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['3.2', '3.3', '3.4', '3.5']
+        ruby-version: ['3.2', '3.3', '3.4', '4.0']
 
     steps:
     - uses: actions/checkout@v2