chore(deps): bump the production-dependencies group across 1 directory with 3 updates

Bumps the production-dependencies group with 3 updates in the / directory: [flexsearch](https://github.com/nextapps-de/flexsearch), [preact](https://github.com/preactjs/preact) and [shiki](https://github.com/shikijs/shiki/tree/HEAD/packages/shiki).


Updates `flexsearch` from 0.8.205 to 0.8.212
- [Release notes](https://github.com/nextapps-de/flexsearch/releases)
- [Changelog](https://github.com/nextapps-de/flexsearch/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nextapps-de/flexsearch/commits)

Updates `preact` from 10.28.1 to 10.28.2
- [Release notes](https://github.com/preactjs/preact/releases)
- [Commits](preactjs/preact@10.28.1...10.28.2)

Updates `shiki` from 1.26.2 to 3.21.0
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Commits](https://github.com/shikijs/shiki/commits/v3.21.0/packages/shiki)

---
updated-dependencies:
- dependency-name: flexsearch
  dependency-version: 0.8.212
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: production-dependencies
- dependency-name: preact
  dependency-version: 10.28.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: production-dependencies
- dependency-name: shiki
  dependency-version: 3.21.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: production-dependencies
...

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

Author: dependabot[bot]

package-lock.json

@@ -46,7 +46,7 @@
     "cli-spinner": "^0.2.10",
     "d3": "^7.9.0",
     "esbuild-sass-plugin": "^3.3.1",
-    "flexsearch": "^0.8.205",
+    "flexsearch": "^0.8.212",
     "github-slugger": "^2.0.0",
     "globby": "^16.1.0",
     "gray-matter": "^4.0.3",
@@ -62,7 +62,7 @@
     "micromorph": "^0.4.5",
     "minimatch": "^10.1.1",
     "pixi.js": "^8.15.0",
-    "preact": "^10.28.1",
+    "preact": "^10.28.2",
     "preact-render-to-string": "^6.6.5",
     "pretty-bytes": "^7.1.0",
     "pretty-time": "^1.1.0",
@@ -86,7 +86,7 @@
     "satori": "^0.18.3",
     "serve-handler": "^6.1.6",
     "sharp": "^0.34.5",
-    "shiki": "^1.26.2",
+    "shiki": "^3.21.0",
     "source-map-support": "^0.5.21",
     "to-vfile": "^8.0.0",
     "toml": "^3.0.0",