Exclude older than 2.6 on macos-14

Author: nobu

.github/workflows/test.yml

@@ -21,6 +21,8 @@ jobs:
           - macos-latest
           - windows-latest
         ruby-version: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
+        exclude:
+          - {runs-on: macos-latest, ruby-version: 2.5}
         # include:
         #   - runs-on: ubuntu-latest
         #     ruby-version: truffleruby