Update dependency wikimedia/remex-html to v4

This MR contains the following updates:

Package	Type	Update	Change
wikimedia/remex-html (source)	require	major	3.0.2 -> 4.0.0

---

Release Notes

wikimedia/mediawiki-libs-RemexHtml

v4.0.0

Compare Source

• Drop PHP 7.2 and PHP 7.3 support.
• Update PHPUnit dependency.

v3.0.3

Compare Source

• Workaround PHP bug which decodes entities when setting attribute values. (T324408, https://github.com/php/php-src/pull/10132 )

---

Configuration

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

🚦 Automerge: Enabled.

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

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

---

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

---

This MR has been generated by Renovate Bot.