Verification

• This issue's title and/or description do not reference a single formula e.g. brew install wget. If they do, open an issue at https://github.com/Homebrew/homebrew-core/issues/new/choose instead.

Provide a detailed description of the proposed feature

ostruct will no longer be a default gem as of Ruby 3.5: ruby/ruby#10428
It's already discouraged for "performance, version compatibility, and potential security issues".

We have two instances to clean up:

Library/Homebrew/cli/args.rb
Library/Homebrew/cmd/uses.rb

What is the motivation for the feature?

☝️

How will the feature be relevant to at least 90% of Homebrew users?

resolution of the performance, version compatibility, and potential security issues described above.

What alternatives to the feature have been considered?

None