feat: new web middleware

[wolfy1339]

Resolves #623

---

Before the change?

• Users of platforms that don't have the unref() function property on setTimeout would get errors
• No web standard middleware was exported

After the change?

• Adds a new web standards middleware
• Bumps the required version of @octokit/webhooks to v18.7.0

Pull request checklist

• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] 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
• [x] No

---

[github-actions[bot]]

👋 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! 🚀

[akku1139]

It seems to be working fine! I had some issues with the private key format when trying to get it to work on Cloudflare Workers without nodejs_compat, so maybe it should be added that to the README.

https://github.com/octokit/auth-app.js#standalone-usage https://github.com/gr2m/universal-github-app-jwt#private-key-formats https://github.com/gr2m/universal-github-app-jwt/blob/715d7b5f5327e4d49afe99ff9d4aaed3d36a33b0/lib/get-token.js#L23-L27