Remove Ruby 4.0.4 from the list of previous Ruby versions

Author: komoju-prem

README.md

@@ -48,7 +48,6 @@ public.ecr.aws/degica/rails-base:4.0.0
 public.ecr.aws/degica/rails-base:4.0.1
 public.ecr.aws/degica/rails-base:4.0.2
 public.ecr.aws/degica/rails-base:4.0.3
-public.ecr.aws/degica/rails-base:4.0.4
 ```
 
 
@@ -103,7 +102,6 @@ public.ecr.aws/degica/rails-buildpack:4.0.0
 public.ecr.aws/degica/rails-buildpack:4.0.1
 public.ecr.aws/degica/rails-buildpack:4.0.2
 public.ecr.aws/degica/rails-buildpack:4.0.3
-public.ecr.aws/degica/rails-buildpack:4.0.4
 ```
 
 Additional older buildpacks can be found at https://gallery.ecr.aws/degica/rails-buildpack