Work with ubuntu-latest using 24.04 by default in CI

Author: jeremyevans

.github/workflows/ci.yml

@@ -11,11 +11,15 @@ permissions:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ "1.9.3", "2.0.0", 2.1, 2.3, 2.4, 2.5, 2.6, 2.7, "3.0", 3.1, 3.2, 3.3, 3.4, jruby-9.2, jruby-9.3, jruby-9.4 ]
+        os: [ubuntu-latest]
+        ruby: [ "2.0.0", 2.1, 2.3, 2.4, 2.5, 2.6, 2.7, "3.0", 3.1, 3.2, 3.3, 3.4, jruby-9.3, jruby-9.4 ]
+        include:
+          - { os: ubuntu-22.04, ruby: "1.9.3" }
+          - { os: ubuntu-22.04, ruby: jruby-9.2 }
+    runs-on: ${{ matrix.os }}
     name: ${{ matrix.ruby }}
     env:
       BUNDLE_GEMFILE: .ci.gemfile