Fix @udecode/plate-markdown deserializing list with indented block element

[depressedX]

brief

it will throw error when deserializing list with indented block element (eg. code block) using @udecode/plate-markdown

- 1
- 2
  - 2.1
  ```
  2.2 code
  ```

it expects to render a nested code block element like this rendered by github:

---

• 1
• 2
  • 2.1

  2.2 code
  

---

while using @udecode/plate-markdown to deserializing it will throw runtime errors.

problem

@udecode/plate-markdown will treat every child of list as listItem. But it's totally legal to put another element into list

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[changeset-bot]

🦋 Changeset detected

Latest commit: 40cd0d7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@udecode/plate-markdown	Patch
@udecode/plate	Patch

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Name	Status	Preview	Comments	Updated (UTC)
plate	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 29, 2024 8:45am

[zbeyens]

Thanks for the PR @depressedX !