[Rubocop] Enforce consistent lambda notation

.rubocop.yml

@@ -125,6 +125,9 @@ Style/HashSyntax:
 Style/IfUnlessModifier:
   Enabled: false
 
+Style/Lambda:
+  EnforcedStyle: literal
+
 Style/NumericPredicate:
   EnforcedStyle: comparison
 

app/controllers/application_controller.rb

@@ -190,7 +190,7 @@ class ApplicationController < ActionController::Base
     return unless request.get? || request.head?
     params[:search] ||= ActionController::Parameters.new
 
-    deep_reject_blank = lambda do |hash|
+    deep_reject_blank = ->(hash) do
       hash.reject { |k, v| v.blank? || (v.is_a?(Hash) && deep_reject_blank.call(v).blank?) }
     end
     if params[:search].is_a?(ActionController::Parameters)

app/logical/file_methods.rb

@@ -49,7 +49,7 @@ module FileMethods
     return false if !is_image?
 
     image = Vips::Image.new_from_file(file_path)
-    fetch = lambda do |key|
+    fetch = ->(key) do
       value = image.get(key)
       value.encode("ASCII", invalid: :replace, undef: :replace).gsub("\u0000", "")
     rescue Vips::Error