[release] 2.6.0 - Add Support for Release Pipelines (#400)

### New Features
  - Adds support for release pipelines
  ### Improvements
  - Remove sinceTime from DCS url when zero
  ### Fixes
  - Handles case where null target for condition to prevent error





>Included In This Release
>- 274caa5 sroyal-statsig
>   - Release Pipeline Support (#399)
>- be971e5 sroyal-statsig
>   - Handle Null Target for Condition (#398)
>- 2c30526 sroyal-statsig
>   - Remove Since Time From DCS URL When Zero (#396)

Author: sroyal-statsig

lib/statsig.rb

@@ -386,7 +386,7 @@ def self.get_client_initialize_response(
   def self.get_statsig_metadata
     {
       'sdkType' => 'ruby-server',
-      'sdkVersion' => '2.5.5',
+      'sdkVersion' => '2.6.0',
       'languageVersion' => RUBY_VERSION
     }
   end

statsig.gemspec

@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |s|
   s.name        = 'statsig'
-  s.version     = '2.5.5'
+  s.version     = '2.6.0'
   s.summary     = 'Statsig server SDK for Ruby'
   s.description = 'Statsig server SDK for feature gates and experimentation in Ruby'
   s.authors     = ['Statsig, Inc']