fix memoize on class method (#1787)

app/services/osuny/theme_info.rb

 class Osuny::ThemeInfo
 
   def self.get_current_version
-    @last_version ||= client.releases(ENV["GITHUB_WEBSITE_THEME_REPOSITORY"]).first[:tag_name]
+    client.releases(ENV["GITHUB_WEBSITE_THEME_REPOSITORY"]).first[:tag_name]
   end
 
   def self.get_current_sha
-    @current_theme_sha ||= client.branch(ENV["GITHUB_WEBSITE_THEME_REPOSITORY"], ENV["GITHUB_WEBSITE_THEME_BRANCH"])[:commit][:sha]
+    client.branch(ENV["GITHUB_WEBSITE_THEME_REPOSITORY"], ENV["GITHUB_WEBSITE_THEME_BRANCH"])[:commit][:sha]
   end
 
   private