[npm] Bump @types/js-yaml from 3.12.10 to 4.0.9 in /packages/mdsvex

Bumps [@types/js-yaml](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/js-yaml) from 3.12.10 to 4.0.9.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/js-yaml)

---
updated-dependencies:
- dependency-name: "@types/js-yaml"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

packages/mdsvex/package.json

@@ -37,7 +37,7 @@
 		"@types/escape-html": "^1.0.0",
 		"@types/estree": "^0.0.45",
 		"@types/hast": "^2.3.1",
-		"@types/js-yaml": "^3.12.5",
+		"@types/js-yaml": "^4.0.9",
 		"escape-html": "^1.0.3",
 		"front-matter": "^4.0.0",
 		"js-yaml": "^3.13.1",