Replace mdast with @types/mdast (#4882)

* Replace `mdast` with `@types/mdast`

* Add PR number

* Revert

* Use @types/mdast

Author: compulim

CHANGELOG.md

@@ -47,6 +47,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 -  Resolves [#4842](https://github.com/microsoft/BotFramework-WebChat/issues/4842). Added provenance in activity status, by [@compulim](https://github.com/compulim), in PR [#4846](https://github.com/microsoft/BotFramework-WebChat/pull/4846)
 -  Resolves [#4856](https://github.com/microsoft/BotFramework-WebChat/issues/4856). Added types for `useStyleSet`, by [@compulim](https://github.com/compulim), in PR [#4857](https://github.com/microsoft/BotFramework-WebChat/pull/4857)
 
+### Changed
+
+-  Fixed [#4875](https://github.com/microsoft/BotFramework-WebChat/issues/4875). Replaced [`mdast`](https://npmjs.com/package/mdast/) with [`@types/mdast`](https://npmjs.com/package/@types/mdast/), by [@compulim](https://github.com/compulim), in PR [#4882](https://github.com/microsoft/BotFramework-WebChat/pull/4882)
+
 ## [4.15.9] - 2023-08-25
 
 ### Fixed

packages/bundle/package-lock.json

@@ -103,7 +103,6 @@
     "markdown-it-attrs-es5": "2.0.2",
     "markdown-it-for-inline": "0.1.1",
     "math-random": "2.0.1",
-    "mdast": "3.0.0",
     "mdast-util-from-markdown": "2.0.0",
     "memoize-one": "6.0.0",
     "microsoft-cognitiveservices-speech-sdk": "1.17.0",
@@ -121,6 +120,7 @@
     "@babel/preset-env": "^7.19.1",
     "@babel/preset-react": "^7.18.6",
     "@babel/preset-typescript": "^7.18.6",
+    "@types/mdast": "^4.0.3",
     "@types/node": "^20.5.8",
     "@types/react": "^18.2.21",
     "babel-loader": "^9.1.3",