Also remove the newly introduced debug gem

```
gem "debug", ">= 1.0.0", platforms: %i[ mri mingw x64_mingw ]
```

Author: pirj

example_app_generator/generate_app.rb

@@ -20,7 +20,7 @@
   # edge branches
   gsub_file 'Gemfile', /^.*\bgem ['"]rails.*$/, ''
   gsub_file "Gemfile", /.*web-console.*/, ''
-  gsub_file "Gemfile", /.*debugger.*/, ''
+  gsub_file "Gemfile", /.*debug.*/, ''
   gsub_file "Gemfile", /.*puma.*/, ''
   gsub_file "Gemfile", /.*bootsnap.*/, ''