Fix failures in ./spec/bundler/quality_spec.rb

```
Failures:

  1) The library itself does not contain any warnings
     Failure/Error: raise "Invoking #{method}!(#{args.map(&:inspect).join(", ")}) failed:\n#{last_command.stdboth}"

     RuntimeError:
       Invoking sys_exec!("ruby -w") failed:
       /home/user/snapshot-master/lib/bundler/cli/add.rb:4:in `<module:Bundler>': uninitialized constant Bundler::CLI (NameError)
        from /home/user/snapshot-master/lib/bundler/cli/add.rb:3:in `<top (required)>'
        from /home/user/snapshot-master/lib/rubygems/core_ext/kernel_require.rb:91:in `require'
        from /home/user/snapshot-master/lib/rubygems/core_ext/kernel_require.rb:91:in `require'
        from -:2:in `<main>'

       Commands:
       $ ruby -w
       /home/user/snapshot-master/lib/bundler/cli/add.rb:4:in `<module:Bundler>': uninitialized constant Bundler::CLI (NameError)
        from /home/user/snapshot-master/lib/bundler/cli/add.rb:3:in `<top (required)>'
        from /home/user/snapshot-master/lib/rubygems/core_ext/kernel_require.rb:91:in `require'
        from /home/user/snapshot-master/lib/rubygems/core_ext/kernel_require.rb:91:in `require'
        from -:2:in `<main>'
       # $? => 1
```

1 files changed, 1 insertions, 0 deletions

diff --git a/spec/bundler/quality_spec.rb b/spec/bundler/quality_spec.rb
index faeeedff5f..31b71269b1 100644
--- a/spec/bundler/quality_spec.rb
+++ b/spec/bundler/quality_spec.rb
@@ -234,6 +234,7 @@ RSpec.describe "The library itself" do
     files_to_require = lib_tracked_files.grep(/\.rb$/) - exclusions
     files_to_require.reject! {|f| f.start_with?("lib/bundler/vendor") }
     files_to_require.map! {|f| File.expand_path(f, source_root) }
+    files_to_require.sort!
     sys_exec!("ruby -w") do |input, _, _|
       files_to_require.each do |f|
         input.puts "require '#{f}'"