[npm] Bump shiki from 0.9.15 to 1.22.1 in /packages/mdsvex

Bumps [shiki](https://github.com/shikijs/shiki/tree/HEAD/packages/shiki) from 0.9.15 to 1.22.1.
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Changelog](https://github.com/shikijs/shiki/blob/main/CHANGELOG.md)
- [Commits](https://github.com/shikijs/shiki/commits/v1.22.1/packages/shiki)

---
updated-dependencies:
- dependency-name: shiki
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

packages/mdsvex/package.json

@@ -58,7 +58,7 @@
 		"retext": "^7.0.1",
 		"retext-smartypants": "^4.0.0",
 		"rollup-plugin-svelte": "^5.1.1",
-		"shiki": "^0.9.3",
+		"shiki": "^1.22.1",
 		"svelte": "^4.0.0",
 		"toml": "^3.0.0",
 		"unified": "^9.1.0",