Remove duplicate import

Author: hmac

ruby/ql/lib/codeql/ruby/frameworks/ActiveSupport.qll

@@ -7,7 +7,6 @@ private import ruby
 private import codeql.ruby.Concepts
 private import codeql.ruby.DataFlow
 private import codeql.ruby.dataflow.FlowSummary
-private import codeql.ruby.Concepts
 private import codeql.ruby.ApiGraphs
 private import codeql.ruby.frameworks.stdlib.Logger::Logger as StdlibLogger