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rubygems: regenerate server certificates used in tests

• test/rubygems/*_{cert,cert_32}.pem: Regenerate test certificates for
  OpenSSL 1.1.0. This is already in upstream.
  https://github.com/rubygems/rubygems/commit/9be5c53939440a61c4bba73cfffbeb5cfadf72be
  [ruby-core:75225] [Feature #12324]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55317 b2dd03c8-39d4-4d8f-98ff-823fe69b080e