Update rubygems 2.6.5 and 2.6.6.
  Release note of 2.6.5: https://github.com/rubygems/rubygems/commit/656f5d94dc888d78d0d00f3598a4fa37391aac80
  Release note of 2.6.6: https://github.com/rubygems/rubygems/commit/ccb9c3300c063f5b5656669972d24a10ef8afbf5

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55495 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  HEAD(2c6d256). It contains to update vendored Molinillo to 0.5.0.
  https://github.com/rubygems/rubygems/pull/1638

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55441 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* object.c, numeric.c, enum.c, ext/-test-/bignum/mul.c,
  lib/rexml/quickpath.rb, lib/rexml/text.rb, lib/rexml/xpath_parser.rb,
  lib/rubygems/specification.rb, lib/uri/generic.rb,
  bootstraptest/test_eval.rb, basictest/test.rb,
  test/-ext-/bignum/test_big2str.rb, test/-ext-/bignum/test_div.rb,
  test/-ext-/bignum/test_mul.rb, test/-ext-/bignum/test_str2big.rb,
  test/csv/test_data_converters.rb, test/date/test_date.rb,
  test/json/test_json_generate.rb, test/minitest/test_minitest_mock.rb,
  test/openssl/test_cipher.rb, test/rexml/test_jaxen.rb,
  test/ruby/test_array.rb, test/ruby/test_basicinstructions.rb,
  test/ruby/test_bignum.rb, test/ruby/test_case.rb,
  test/ruby/test_class.rb, test/ruby/test_complex.rb,
  test/ruby/test_enum.rb, test/ruby/test_eval.rb,
  test/ruby/test_iseq.rb, test/ruby/test_literal.rb,
  test/ruby/test_math.rb, test/ruby/test_module.rb,
  test/ruby/test_numeric.rb, test/ruby/test_range.rb,
  test/ruby/test_rational.rb, test/ruby/test_refinement.rb,
  test/ruby/test_rubyvm.rb, test/ruby/test_struct.rb,
  test/ruby/test_variable.rb, test/rubygems/test_gem_specification.rb,
  test/thread/test_queue.rb: Use Integer instead of Fixnum and Bignum.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55029 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  Please see entries of 2.6.4 on
  https://github.com/rubygems/rubygems/blob/master/History.txt

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54804 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  Please see entries of 2.6.3 on
  https://github.com/rubygems/rubygems/blob/master/History.txt

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54500 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  Please see entries of 2.6.2 on
  https://github.com/rubygems/rubygems/blob/master/History.txt

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54308 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  https://github.com/rubygems/rubygems/pull/1554
  [Bug #12193][ruby-core:74431]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54307 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  Please see entries of 2.6.0 and 2.6.1 on
  https://github.com/rubygems/rubygems/blob/master/History.txt
  [fix GH-1270] Patch by @segiddins

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53992 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  shebang.
* lib/rubygems/package.rb, lib/rubygems/package/*: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53712 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  It supports to enable frozen string literal and add `--norc` option for
  disable to `.gemrc` configuration.
  See 2.5.2 release notes for other fixes and enhancements.
  https://github.com/rubygems/rubygems/blob/a8aa3bac723f045c52471c7b9328310a048561e0/History.txt#L3

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53707 b2dd03c8-39d4-4d8f-98ff-823fe69b080e