Avoid using Symbol#to_proc against a refined method

because Bullet still supports Ruby 2.3 that does not yet have native
Symbol#to_proc, it calles the Active Support version, and since our
refinements are not in use there, it would cause NoMethodError.
https://github.com/flyerhzm/bullet/actions/runs/9984807517/job/27594646503?pr=709

lib/bullet/detector/counter_cache.rb

@@ -23,11 +23,11 @@ def add_possible_objects(object_or_objects)
           return unless Bullet.counter_cache_enable?
 
           objects = Array.wrap(object_or_objects)
-          return if objects.map(&:bullet_primary_key_value).compact.empty?
+          return if objects.map { |object| object.bullet_primary_key_value }.compact.empty?
 
           Bullet.debug(
             'Detector::CounterCache#add_possible_objects',
-            "objects: #{objects.map(&:bullet_key).join(', ')}"
+            "objects: #{objects.map{ |object| object.bullet_key }.join(', ')}"
           )
           objects.each { |object| possible_objects.add object.bullet_key }
         end