Update ubuntu versions in CI

Author: collimarco

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, ubuntu-22.04]
+        os: [ubuntu-22.04, ubuntu-24.04]
         ruby-version: ['3.0', '3.1', '3.2', '3.3']
     runs-on: ${{ matrix.os }}
     steps: