Upgrade spring binstubs

I ran `bundle exec spring binstub --all` after reading about the update
in the changelog.

bin/rails

@@ -1,9 +1,5 @@
 #!/usr/bin/env ruby
-begin
-  load File.expand_path('../spring', __FILE__)
-rescue LoadError => e
-  raise unless e.message.include?('spring')
-end
+load File.expand_path("spring", __dir__)
 APP_PATH = File.expand_path('../config/application', __dir__)
 require_relative '../config/boot'
 require 'rails/commands'

bin/rake

@@ -1,9 +1,5 @@
 #!/usr/bin/env ruby
-begin
-  load File.expand_path('../spring', __FILE__)
-rescue LoadError => e
-  raise unless e.message.include?('spring')
-end
+load File.expand_path("spring", __dir__)
 require_relative '../config/boot'
 require 'rake'
 Rake.application.run

bin/rspec

@@ -1,8 +1,4 @@
 #!/usr/bin/env ruby
-begin
-  load File.expand_path('../spring', __FILE__)
-rescue LoadError => e
-  raise unless e.message.include?('spring')
-end
+load File.expand_path("spring", __dir__)
 require 'bundler/setup'
 load Gem.bin_path('rspec-core', 'rspec')

bin/spring

@@ -1,17 +1,14 @@
 #!/usr/bin/env ruby
 
-# This file loads Spring without using Bundler, in order to be fast.
+# This file loads Spring without using loading other gems in the Gemfile, in order to be fast.
 # It gets overwritten when you run the `spring binstub` command.
 
-unless defined?(Spring)
-  require 'rubygems'
-  require 'bundler'
+if !defined?(Spring) && [nil, "development", "test"].include?(ENV["RAILS_ENV"])
+  require "bundler"
 
-  lockfile = Bundler::LockfileParser.new(Bundler.default_lockfile.read)
-  spring = lockfile.specs.detect { |spec| spec.name == 'spring' }
-  if spring
+  Bundler.locked_gems.specs.find { |spec| spec.name == "spring" }&.tap do |spring|
     Gem.use_paths Gem.dir, Bundler.bundle_path.to_s, *Gem.path
-    gem 'spring', spring.version
-    require 'spring/binstub'
+    gem "spring", spring.version
+    require "spring/binstub"
   end
 end