build(deps-dev): bump shiki from 1.29.2 to 4.2.0

Bumps [shiki](https://github.com/shikijs/shiki/tree/HEAD/packages/shiki) from 1.29.2 to 4.2.0.
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Commits](https://github.com/shikijs/shiki/commits/v4.2.0/packages/shiki)

---
updated-dependencies:
- dependency-name: shiki
  dependency-version: 4.2.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

bun.lock

@@ -21,7 +21,7 @@
     "marked": "^18.0.5",
     "prettier": "^3.8.4",
     "sharp": "^0.35.2",
-    "shiki": "1.29.2",
+    "shiki": "4.2.0",
     "subset-font": "^2.5.0",
     "typescript": "^6.0.3",
     "vitepress": "^1.6.4"