Stop relying on transitive uri loads

[p-linnane]

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Claude Code grepped for the same URI::Generic-without-require "uri" shape across the tree, classified each site (sig-only vs runtime use), and applied the matching fix. I reviewed the diff and ensured a clean brew lgtm.

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Companion to #22160. Fixes the remaining instances of this issue.

[Copilot]

Pull request overview

This PR removes reliance on transitive require "uri" loading by either explicitly requiring Ruby’s uri stdlib where it’s used at runtime or by preventing Sorbet runtime signature evaluation from referencing URI::Generic.

Changes:

• Switch selected Sorbet signatures that mention URI::Generic to T::Sig::WithoutRuntime.sig to avoid runtime evaluation.
• Add explicit require "uri" where URI(...) / URI::... is used at runtime (e.g., Formulary URI loading, Cask URL parsing).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
Library/Homebrew/utils/github/api.rb	Avoids runtime evaluation of sigs that reference URI::Generic by using T::Sig::WithoutRuntime.sig.
Library/Homebrew/github_packages.rb	Uses T::Sig::WithoutRuntime.sig for the URI::Generic-typed schema resolver signature to avoid transitive uri dependency.
Library/Homebrew/formulary.rb	Adds explicit require "uri" to support runtime URI parsing/regex usage in formulary loaders.
Library/Homebrew/cask/url.rb	Adds explicit require "uri" to support runtime URI(...) usage in cask URL handling.

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[MikeMcQuaid]

Thanks!