Add arm64-darwin support and update RuboCop configuration

[benrfairless]

Relevant issue(s)

• N/A

What does this do?

1. Modifies RuboCop configuration to align with Capybara style changes introduced in version 2.23.
2. Adds support for the arm64-darwin platform and updates the Gemfile.lock to include necessary dependencies.

Why was this needed?

This change ensures adherence to the latest coding standards for Capybara, improving code quality and maintainability.

It also stops the CI from having a whinge

Implementation/Deploy Steps (Optional)

1. Ensure that this PR passes CI
2. perform a dependabot rebase on the other PRs

Notes to reviewer (Optional)

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	nokogiri@​1.19.3-x86_64-darwin ⏵ 1.19.3-arm64-darwin

View full report

[jamezpolley]

I'd prefer to have these two changes as separate PRs, but they're small enough and in seperate commits so I'm happy to approve as-is