upgrade rspec 3

[jitingcn]

Description
I got an error when I ran rake after bundle install, After some searching (sof), the issue is that rake 11.0 removed the last_comment method, which was used by rspec-core (< 3.4.4)

Possible solutions include restricting rake version

gem 'rake', '< 11.0'

or upgrading the rspec version, which I think is a good option for long-term consideration.

This issue only affects run rake locally and does not affect run rspec tests alone, or the normal use the gem.

Logs

$ rake
rake aborted!
NoMethodError: undefined method `last_comment' for #<Rake::Application:0x00007f1be23e2588>
/home/jiting/RubymineProjects/meilisearch-rails/Rakefile:16:in `new'
/home/jiting/RubymineProjects/meilisearch-rails/Rakefile:16:in `<top (required)>'
/home/jiting/.rbenv/versions/2.7.2/bin/bundle:23:in `load'
/home/jiting/.rbenv/versions/2.7.2/bin/bundle:23:in `<main>'

Environment (please complete the following information):

• OS: Arch Linux
• MeiliSearch version: v.0.24.0
• meilisearch-rails version: 0.3.0
• Ruby version: 2.7.2
• Rake version: 13.0.6