chore(deps): update dependency rails to v6

[renovate]

This PR contains the following updates:

Package	Update	Change
rails	major	~> 3.2 -> ~> 6.0

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻️ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you check the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: Gemfile.lock

ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux]
Successfully installed bundler-1.12.5
1 gem installed
Fetching gem metadata from https://rubygems.org/
Fetching version metadata from https://rubygems.org/
Fetching dependency metadata from https://rubygems.org/
Resolving dependencies.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Bundler could not find compatible versions for gem "railties":
  In Gemfile:
    rails (~> 6.0) was resolved to 6.0.0, which depends on
      railties (= 6.0.0)

    sass-rails (~> 3.2) was resolved to 3.2.0, which depends on
      railties (~> 3.2.0.beta)

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