Bump @types/react-dom from 19.1.8 to 19.1.9 in the npm group (#1970)

Bumps the npm group with 1 update: [@types/react-dom](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-dom).


Updates `@types/react-dom` from 19.1.8 to 19.1.9
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react-dom)

---
updated-dependencies:
- dependency-name: "@types/react-dom"
  dependency-version: 19.1.9
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm
...

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Author: dependabot[bot]

package.json

@@ -37,7 +37,7 @@
     "@types/mdx": "^2.0.13",
     "@types/node": "^24.3.0",
     "@types/react": "^19.1.12",
-    "@types/react-dom": "^19.1.8",
+    "@types/react-dom": "^19.1.9",
     "eslint": "^9.34.0",
     "eslint-config-import": "^0.13.0",
     "eslint-config-next": "^15.5.2",