Update dependency AngleSharp to 1.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
AngleSharp (source)	1.3.1 -> 1.4.0

---

Release Notes

AngleSharp/AngleSharp (AngleSharp)

v1.4.0

Released on Wednesday, November 12 2025.

• Fixed handling of carriage return in text sources
• Added support for of syntax in :nth-child functions within CSS selectors
• Added selectedcontent to known elements (#​1230)
• Added :open, ::checkmark, ::picker-icon, and ::picker(ident) to selector syntax (#​1230)
• Added parsing for customizable <select> (#​1230)
• Added .NET 10 as an explicit target

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.