chore(deps): update shiki monorepo to v2 (major) (sveltejs#1037)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

docs-svelte-kit/package.json

@@ -16,8 +16,8 @@
     "@babel/types": "^7.26.0",
     "@fontsource/fira-mono": "^5.1.0",
     "@ota-meshi/eslint-plugin": "^0.17.6",
-    "@shikijs/markdown-it": "^1.24.0",
-    "@shikijs/twoslash": "^1.24.0",
+    "@shikijs/markdown-it": "^2.0.0",
+    "@shikijs/twoslash": "^2.0.0",
     "@sindresorhus/slugify": "^2.2.1",
     "@sveltejs/adapter-static": "^3.0.6",
     "@sveltejs/kit": "^2.8.5",