Add Ruby 3.4 to CI

Drop Ruby 3.0 now that it is EOL.

Author: jeremyevans

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ "3.0", 3.1, 3.2, 3.3, jruby-9.3, jruby-9.4 ]
+        ruby: [ 3.1, 3.2, 3.3, 3.4, jruby-9.3, jruby-9.4 ]
     name: ${{ matrix.ruby }}
     env:
       BUNDLE_GEMFILE: .ci.gemfile