Address rubocop unhappiness with single vs. double quoted strings

Author: hms

app/models/solid_queue/semaphore.rb

@@ -61,7 +61,7 @@ def attempt_creation_with_create_and_exception_handling
           limit == 1 ? false : attempt_decrement
         end
 
-        if ActiveRecord::Base.connection.adapter_name == 'PostgreSQL'
+        if ActiveRecord::Base.connection.adapter_name == "PostgreSQL"
           alias attempt_creation attempt_creation_with_insert_on_conflict
         else
           alias attempt_creation attempt_creation_with_create_and_exception_handling