Disable rubocop Metrics/PerceivedComplexity for with_expectation

Author: benoittgt

lib/rspec/support/method_signature_verifier.rb

@@ -280,7 +280,7 @@ def initialize(signature, args=[])
         @arbitrary_kw_args = @unlimited_args = false
       end
 
-      def with_expectation(expectation) # rubocop:disable MethodLength
+      def with_expectation(expectation) # rubocop:disable MethodLength, Metrics/PerceivedComplexity
         return self unless MethodSignatureExpectation === expectation
 
         if expectation.empty?