Bump @shikijs/transformers from 3.8.1 to 3.9.1 in /landing-page

Bumps [@shikijs/transformers](https://github.com/shikijs/shiki/tree/HEAD/packages/transformers) from 3.8.1 to 3.9.1.
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Commits](https://github.com/shikijs/shiki/commits/v3.9.1/packages/transformers)

---
updated-dependencies:
- dependency-name: "@shikijs/transformers"
  dependency-version: 3.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

landing-page/package-lock.json

@@ -12,7 +12,7 @@
     "@next/third-parties": "^15.4.5",
     "@radix-ui/react-icons": "^1.3.2",
     "@radix-ui/react-slot": "^1.2.3",
-    "@shikijs/transformers": "^3.8.1",
+    "@shikijs/transformers": "^3.9.1",
     "@tailwindcss/typography": "^0.5.16",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",