[rubygems/rubygems] Remove now unneeded code

We patch `net-http-persistent` to not autoload `openssl`.

https://github.com/rubygems/rubygems/commit/757dec3cf2

lib/bundler/vendored_persistent.rb

@@ -1,12 +1,5 @@
 # frozen_string_literal: true
 
-# We forcibly require OpenSSL, because net/http/persistent will only autoload
-# it. On some Rubies, autoload fails but explicit require succeeds.
-begin
-  require "openssl"
-rescue LoadError
-  # some Ruby builds don't have OpenSSL
-end
 module Bundler
   module Persistent
     module Net