chore(deps): update dependency flexsearch to ~0.8.138

Author: renovate[bot]

package.json

@@ -29,7 +29,7 @@
     "diff": "^7.0.0",
     "ethers": "^6.13.5",
     "file": "^0.2.2",
-    "flexsearch": "~0.7.43",
+    "flexsearch": "~0.8.138",
     "fs-extra": "^11.3.0",
     "gray-matter": "^4.0.3",
     "html-dom-parser": "^5.0.13",