bump up eslint-plugin-markdown to support eslint V9

[tianyingchun]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)

Affected packages and versions

eslint-plugin-mdx

Link to runnable example

No response

Steps to reproduce

eslint-plugin-mdx has limited eslint-plugin-mardown version to "eslint-plugin-markdown": "^3.0.1", need to upgrade to "eslint-plugin-markdown": "^5.0.0",

Expected behavior

bump "eslint-plugin-markdown": "^3.0.1", to "eslint-plugin-markdown": "^5.0.0",

Actual behavior

"eslint-plugin-markdown": "^3.0.1",`

Runtime

Node v20

Package manager

yarn v4

OS

macOS

Build and bundle tools

Other (please specify in steps to reproduce)

[ChristianMurphy]

There are a number of changes needed for ESLint 9 support #477

[ChristianMurphy]

Closing this as a part of the larger ESLint 9 issue #477