Bump Bootsnap to 1.4.1

1.4.1 contains a number of bug fixes and performance improvements:
https://github.com/Shopify/bootsnap/blob/master/CHANGELOG.md

Gemfile

@@ -325,7 +325,7 @@ group :development do
 end
 
 group :development, :test do
-  gem 'bootsnap', '~> 1.3'
+  gem 'bootsnap', '~> 1.4'
   gem 'bullet', '~> 5.5.0', require: !!ENV['ENABLE_BULLET']
   gem 'pry-byebug', '~> 3.5.1', platform: :mri
   gem 'pry-rails', '~> 0.3.4'

Gemfile.lock

@@ -85,7 +85,7 @@ GEM
     binding_ninja (0.2.2)
     binding_of_caller (0.8.0)
       debug_inspector (>= 0.0.1)
-    bootsnap (1.3.2)
+    bootsnap (1.4.1)
       msgpack (~> 1.0)
     bootstrap_form (2.7.0)
     brakeman (4.2.1)
@@ -966,7 +966,7 @@ DEPENDENCIES
   benchmark-ips (~> 2.3.0)
   better_errors (~> 2.5.0)
   binding_of_caller (~> 0.8.0)
-  bootsnap (~> 1.3)
+  bootsnap (~> 1.4)
   bootstrap_form (~> 2.7.0)
   brakeman (~> 4.2)
   browser (~> 2.5)