Fix gemfile name

Author: rosston

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         ruby-version: ['3.0', '3.3']
-        gemfile: ['Gemfile', 'Gemfile.rails71']
+        gemfile: ['Gemfile', 'Gemfile_rails71']
         exclude:
           # Rails 7.2 requires Ruby 3.1+
           - ruby-version: '3.0'