Vendor `securerandom` in Bundler as well

It is loaded by `Fetcher` so in most case it's fine.

But if using `bundler/inline` and a gem need to be fetched,
`securerandom` will be loaded and cause a conflict.

Can be reproduced with:

```ruby
require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'graphql', '~> 2.0'
  gem 'graphql-client', '~> 0.18'
end

require 'json'
require 'graphql/client'
require 'graphql/client/http'
```

Ref: https://github.com/rails/rails/pull/52473#issuecomment-2284667451

Co-authored-by: Jean Boussier <jean.boussier@gmail.com>

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