fix(deps): update dependency flexsearch to v0.8.1

Author: renovate[bot]

package-lock.json

@@ -36,7 +36,7 @@
   "dependencies": {
     "@cfworker/json-schema": "4.1.1",
     "clipboard": "2.0.11",
-    "flexsearch": "0.7.43",
+    "flexsearch": "0.8.1",
     "katex": "0.16.21",
     "lodash": "4.17.21",
     "mermaid": "11.5.0",