Add Ruby 3.4 to CI

Author: jeremyevans

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
  strategy:
  fail-fast: false
  matrix:
- ruby: [ 2.3, 2.4, 2.5, 2.6, 2.7, "3.0", 3.1, 3.2, 3.3 ]
+ ruby: [ 2.3, 2.4, 2.5, 2.6, 2.7, "3.0", 3.1, 3.2, 3.3, 3.4 ]
  name: ${{ matrix.ruby }}
  env:
  BUNDLE_GEMFILE: .ci.gemfile