update Gemfile from the template generator_files to use latest gem versions

[pkleanthous-zz]

Description

I'm getting warnings when running a kitchen command

Omnibus Version

omnibus --version
Omnibus v6.0.1

Platform Version

ProductName: Mac OS X
ProductVersion: 10.14.4

Replication Case

gem install omnibus
omnibus new demo-project --deb-assets
cd demo-project
bundle install --binstubs
kitchen list

Build Output

kitchen list
W, [2019-04-09T00:12:17.949254 #65853]  WARN -- : You are setting a key that conflicts with a built-in method Hashie::Mash#frozen? defined in Kernel. This can cause unexpected behavior when accessing the key as a property. You can still access the key via the #[] method.
W, [2019-04-09T00:12:17.949311 #65853]  WARN -- : You are setting a key that conflicts with a built-in method VariaModel::Attributes#frozen? defined in Kernel. This can cause unexpected behavior when accessing the key as a property. You can still access the key via the #[] method.
W, [2019-04-09T00:12:17.949330 #65853]  WARN -- : You are setting a key that conflicts with a built-in method VariaModel::Attributes#frozen? defined in Kernel. This can cause unexpected behavior when accessing the key as a property. You can still access the key via the #[] method.
W, [2019-04-09T00:12:17.950884 #65853]  WARN -- : You are setting a key that conflicts with a built-in method VariaModel::Attributes#default defined in Hash. This can cause unexpected behavior when accessing the key as a property. You can still access the key via the #[] method.
W, [2019-04-09T00:12:17.950911 #65853]  WARN -- : You are setting a key that conflicts with a built-in method VariaModel::Attributes#default defined in Hash. This can cause unexpected behavior when accessing the key as a property. You can still access the key via the #[] method.

---

[pkleanthous-zz]

I have updated the Gemfile inside the project and warnings stopped.

source 'https://rubygems.org'

gem 'omnibus', '~> 6.0'

group :development do
  gem 'berkshelf', '~> 7.0'
  gem 'test-kitchen',    '~> 2.0'
  gem 'kitchen-vagrant', '~> 1.5'
end