chore(deps-dev): bump flexsearch from 0.7.31 to 0.8.158

Bumps [flexsearch](https://github.com/nextapps-de/flexsearch) from 0.7.31 to 0.8.158.
- [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)

---
updated-dependencies:
- dependency-name: flexsearch
  dependency-version: 0.8.158
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -45,7 +45,7 @@
     "eslint": "^9.0",
     "exec-bin": "^1.0.0",
     "hugo-installer": "^4.0",
-    "flexsearch": "^0.7.21",
+    "flexsearch": "^0.8.158",
     "highlight.js": "^11.2",
     "instant.page": "^5.1",
     "katex": "^0.16",