run spring binstub --all during rails app:update

[beauraF]

With Rails 6.0.2.1, when you run rails app:update, spring binstub --all is not run when spring is defined. Which lead to spring no longer being integrated into your binaries.

---

Steps to reproduce

 rails _5.2.3.1_ new foobar
 cd foobar
 cat bin/rake

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

 sed -i -e "s/gem 'rails', '~> 5.2.3.1'/gem 'rails', '6.0.2.1'/" Gemfile
 bundle update rails
 yes | bundle exec rails app:update
 cat bin/rake

#!/usr/bin/env ruby
require_relative '../config/boot'
require 'rake'
Rake.application.run

---

I just add a call to generate_spring_binstubs in bin_when_updating, that do the trick. :)

[yskkin]

This follows #32525 👍

[rails-bot]

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