Correct typo in active storage analyzer

Author: Mth0158

activestorage/lib/active_storage/analyzer/image_analyzer/vips.rb

@@ -32,7 +32,7 @@ def read_image
             {}
           end
         rescue ::Vips::Error => error
-          logger.error "Skipping image analysis due to an Vips error: #{error.message}"
+          logger.error "Skipping image analysis due to a Vips error: #{error.message}"
           {}
         end
       end