fix(types): explicit return type from web middleware()

[Renegade334]

Resolves #1118.

---

Before the change?

... (request: Request) => Promise<import("undici-types").Response>;

After the change?

... (request: Request) => Promise<Response>;

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
  • The original featureset did not add tests.
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

---

[github-actions]

👋 Hi! Thank you for this contribution! Just to let you know, our GitHub SDK team does a round of issue and PR reviews twice a week, every Monday and Friday! We have a process in place for prioritizing and responding to your input. Because you are a part of this community please feel free to comment, add to, or pick up any issues/PRs that are labeled with Status: Up for grabs. You & others like you are the reason all of this works! So thank you & happy coding! 🚀

[jakebailey]

Thanks for sending this; this is causing errors on DefinitelyTyped.

[github-actions]

🎉 This PR is included in version 13.7.4 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

Your semantic-release bot 📦🚀