Update rc version for Ruby

Author: smendes

tools/snippet-testing/model/dependency.rb

@@ -19,7 +19,7 @@ class Dependency
       CSHARP_NAME => ['4.x', '5.5.3-alpha1'],
       PHP_NAME    => ['4.10', '5.11.0-alpha1'],
       PYTHON_NAME => ['5.6.0', '6.4.2-alpha-1'],
-      RUBY_NAME   => ['4.13.0', '5.0.0.rc24'],
+      RUBY_NAME   => ['4.13.0', '5.0.0.rc26'],
       NODE_NAME   => ['2.11.0', '3.4.0-alpha-1'],
       JAVA6_NAME  => {group: "com.twilio.sdk", name: 'twilio-java-sdk', version: '6.3.0', suffix: '-jar-with-dependencies'},
       JAVA7_NAME  => {group: "com.twilio.sdk", name: 'twilio', version: '7.12.0-alpha-1', suffix: '-jar-with-dependencies'}