Bypass git submodule add/update with git config
	 protocol.file.allow=always option.

	Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>
	---
	 test/rubygems/test_gem_source_git.rb | 5 +++++
	 1 file changed, 5 insertions(+)

	[rubygems/rubygems] Use [] instead of double-quotes

	---
	 test/rubygems/test_gem_source_git.rb | 2 +-
	 1 file changed, 1 insertion(+), 1 deletion(-)

https://github.com/ruby/ruby/pull/4122

Add GlobalSign Root CA.
https://github.com/rubygems/rubygems/pull/4100
https://github.com/rubygems/rubygems/pull/4105