Update rubygems to 3.1.5. [Bug #17381]

Add GlobalSign Root CA.
rubygems/rubygems#4100
rubygems/rubygems#4105

lib/rubygems.rb

@@ -9,7 +9,7 @@
 require 'rbconfig'
 
 module Gem
-  VERSION = "3.1.4".freeze
+  VERSION = "3.1.5".freeze
 end
 
 # Must be first since it unloads the prelude from 1.9.2

lib/rubygems/ssl_certs/rubygems.org/GlobalSignRootCA.pem

@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDdTCCAl2gAwIBAgILBAAAAAABFUtaw5QwDQYJKoZIhvcNAQEFBQAwVzELMAkG
+A1UEBhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExEDAOBgNVBAsTB1Jv
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+HMUfpIBvFSDJ3gyICh3WZlXi/EjJKSZp4A==
+-----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-----

test/rubygems/test_bundled_ca.rb

@@ -51,13 +51,16 @@ def test_accessing_rubygems
       assert_https('rubygems.org')
     end
 
-    def test_accessing_fastly
-      assert_https('rubygems.global.ssl.fastly.net')
+    def test_accessing_www_rubygems
+      assert_https('www.rubygems.org')
     end
 
-    def test_accessing_new_index
-      assert_https('fastly.rubygems.org')
+    def test_accessing_staging
+      assert_https('staging.rubygems.org')
     end
 
+    def test_accessing_new_index
+      assert_https('index.rubygems.org')
+    end
   end
 end

version.h

@@ -2,11 +2,11 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 3
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 139
+#define RUBY_PATCHLEVEL 140
 
 #define RUBY_RELEASE_YEAR 2020
-#define RUBY_RELEASE_MONTH 10
-#define RUBY_RELEASE_DAY 11
+#define RUBY_RELEASE_MONTH 12
+#define RUBY_RELEASE_DAY 9
 
 #include "ruby/version.h"