Fix deprecation warnings for secrets:edit/show

[stevegeek]

Motivation / Background

This Pull Request has been created because there is a bug in the deprecation notices on the tasks secrets:edit and secrets:show which means they can raise undefined method 'squish'

Reproduction

Create a new rails 7.1.1 app using rails new.

cd into the new app and run bin/rails secrets:edit or bin/rails secrets:show.

For example:

$ bin/rails secrets:show
...gems/3.2.0/gems/railties-7.1.1/lib/rails/commands/secrets/secrets_command.rb:37:in `show': undefined method `squish' for "`bin/rails secrets:show` is deprecated in favor of credentials and will be removed in Rails 7.2.\nRun `bin/rails credentials:help` for more information.\n":String (NoMethodError)

        Rails.deprecator.warn(<<~MSG.squish)
                                    ^^^^^^^
	from ...gems/3.2.0/gems/thor-1.3.0/lib/thor/command.rb:28:in `run'
        ...

Detail

The warning string is #squished however active_support/core_ext/string/filters is not being required.

The tests are passing because the dummy test application does a require 'rails/all' on boot which requires the String extensions. https://github.com/rails/rails/blob/main/railties/test/isolation/abstract_unit.rb#L605

This is not necessarily the case for other applications, eg ones freshly created with rails new so in this case an error is raised.

The fix is to just require the necessary String extensions.

I am not sure if there is anything that could be done to the tests to have caught this.

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Changes that are unrelated should be opened in separate PRs.
• Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• Tests are added or updated if you fix a bug or add a feature.

[akhilgkrishnan]

Thanks @stevegeek 💯 for the PR.

We need to backport this to 7-1-stable.

[jonathanhefner]

Thank you, @stevegeek! ✔️

Backported to 7-1-stable in 54e2165.

[stevegeek]

Thanks @akhilgkrishnan and @jonathanhefner !