Use https source for github repos with Bundler 1.x

GitHub no longer supports the git:// protocol, which was the default in
Bundler 1.x.

From the build:

    The unauthenticated git protocol on port 9418 is no longer supported.
    Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/
    for more information.

gemfiles/Gemfile-rails-4-1

@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+git_source(:github) do |repo_name|
+  repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?('/')
+  "https://github.com/#{repo_name}.git"
+end
+
 gemspec path: ".."
 
 gem "rails", github: "rails/rails", branch: "4-1-stable"

gemfiles/Gemfile-rails-4-2

@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+git_source(:github) do |repo_name|
+  repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?('/')
+  "https://github.com/#{repo_name}.git"
+end
+
 gemspec path: ".."
 
 gem "rails", github: "rails/rails", branch: "4-2-stable"