sorbet: Bump more RuboCop tests to higher typed levels

[issyl0]

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• I did not use AI/LLM to create this PR, or I disclosed the tool/model below and reviewed its output; I did not attribute commits to AI and will answer maintainer questions and review comments myself without AI/LLM.

Claude Code CLI, Claude Opus 5 (High reasoning, Ultracode was too intense 🤯), with human prompting, review and tweaks.

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• Part of my ongoing quest to bump all the test files to at least Sorbet typed: true, because that's a thing we can do.
• In a 🥞 gh stack because I wanted to try them out on a real chain of changes.
• See the commit message body for the full description of the changes.

[Copilot]

Pull request overview

This PR increases Sorbet type-checking strictness for a RuboCop cop spec by bumping the file to # typed: true, with a small spec refactor to keep the example self-contained.

Changes:

• Bump Library/Homebrew/test/rubocops/urls_spec.rb from typed: false to typed: true.
• Replace a let(:expected_url) with a local expected_url inside the example.

Show a summary per file

File	Description
Library/Homebrew/test/rubocops/urls_spec.rb	Raises Sorbet typing level for the URLs cop spec and adjusts a variable definition to suit the stricter typing context.

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