Remove dead code for Rails 5.x, 6.x, and < 6.1.4

[tagliala]

PR #256 updated the minimum required version of Rails subcomponents to
6.1.4.

However, it also included conditionals specific to version 6.1.4.

This code is unnecessary as the library does not support versions of
Rails below 6.1.4.

---

Please review with "hide whitespace" option enabled

[Mth0158]

Hi @tagliala (again!)
I am totally on for these changes, I wanted to do this in the coming days/weeks, @igorkasyanchuk are you ok to deprecate support for Rails 5.x, and Rails 6 < 6.1.4?
I think it could be in the same release as the #256 release. Unsure if it's better when we drop support for a major of Rails to make a major or minor release?

[tagliala]

Hi,

are you ok to deprecate support for Rails 5.x, and Rails 6 < 6.1.4?

Rails < 6.1.4 support has been already removed in current main, in the meaning that current main will not be installed on < 6.1.4:

active_storage_validations/active_storage_validations.gemspec

Line 25 in bd696b2

%w[activejob activemodel activestorage activesupport].each { |rails_subcomponent| s.add_dependency rails_subcomponent, '>= 6.1.4' }

The code removed here is just dead code, unless I'm missing something

---

edit

Probably the intent of #256 was different, because checks were introduced here, but the gem won't install on Rails < 6.1.4

[Mth0158]

Probably the intent of #256 was different, because checks were introduced here, but the gem won't install on Rails < 6.1.4

Totally right, I shd have removed the dead code with this PR, let's remove it now that it's useless.