build(deps-dev): bump flexsearch from 0.6.32 to 0.7.2

Bumps [flexsearch](https://github.com/nextapps-de/flexsearch) from 0.6.32 to 0.7.2.
- [Release notes](https://github.com/nextapps-de/flexsearch/releases)
- [Changelog](https://github.com/nextapps-de/flexsearch/blob/master/CHANGELOG.md)
- [Commits](nextapps-de/flexsearch@0.6.32...0.7.2)

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

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

package.json

@@ -45,7 +45,7 @@
     "eslint": "^7.29",
     "exec-bin": "^1.0.0",
     "hugo-installer": "^3.0.1",
-    "flexsearch": "^0.6",
+    "flexsearch": "^0.7",
     "highlight.js": "^11.0",
     "instant.page": "^5.1",
     "katex": "^0.13",