RubyGems certs - remove AddTrust, add GlobalSign Root R3

lib/rubygems/ssl_certs/rubygems.org/AddTrustExternalCARoot.pem

@@ -1,25 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIENjCCAx6gAwIBAgIBATANBgkqhkiG9w0BAQUFADBvMQswCQYDVQQGEwJTRTEU
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-mnkPIAou1Z5jJh5VkpTYghdae9C8x49OhgQ=
------END CERTIFICATE-----

lib/rubygems/ssl_certs/rubygems.org/GlobalSignRootCA_R3.pem

@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDXzCCAkegAwIBAgILBAAAAAABIVhTCKIwDQYJKoZIhvcNAQELBQAwTDEgMB4G
+A1UECxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNp
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+Mx86OyXShkDOOyyGeMlhLxS67ttVb9+E7gUJTb0o2HLO02JQZR7rkpeDMdmztcpH
+WD9f
+-----END CERTIFICATE-----