Update .github/workflows/test.yml

Co-authored-by: Copilot <[email protected]>

Author: patch0

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
         gemfile: [ rails_6.1, rails_7.0, rails_7.1, rails_7.2, rails_8.0 ]
         exclude:
           - ruby-version: '3.1'
-            gemfile: 'rails_8.0'
+            gemfile: rails_8.0
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
     steps: