Remove ruby version

Author: MUTOgen

specs_e2e/rails_6_1_7/Gemfile

@@ -1,8 +1,6 @@
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby '2.7.6'
-
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails', branch: 'main'
 gem 'rails', '~> 6.1.7', '>= 6.1.7.10'
 # Use sqlite3 as the database for Active Record