Speed up boot time

by removing an unused `begin ... rescue ... end` block. The block is no longer necessary after moving the bootsnap gem to the :default group in eedf7355.

config/boot.rb

@@ -2,8 +2,4 @@ ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
 
 # Set up gems listed in the Gemfile.
 require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
-begin
-  require 'bootsnap/setup' if ENV['RAILS_ENV'] != 'production' || %w(1 yes true).include?(ENV['ENABLE_BOOTSNAP'])
-rescue LoadError
-  # bootsnap is an optional dependency, so if we don't have it, it's fine
-end
+require 'bootsnap/setup' if ENV['RAILS_ENV'] != 'production' || %w(1 yes true).include?(ENV['ENABLE_BOOTSNAP'])