chore(deps): bump qs from 6.15.1 to 6.15.2

Bumps [qs](https://github.com/ljharb/qs) from 6.15.1 to 6.15.2.
- [Changelog](https://github.com/ljharb/qs/blob/main/CHANGELOG.md)
- [Commits](https://github.com/ljharb/qs/compare/v6.15.1...v6.15.2)

---
updated-dependencies:
- dependency-name: qs
  dependency-version: 6.15.2
  dependency-type: direct:production
...

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

plugins/search-backend/package.json

@@ -68,7 +68,7 @@
     "dataloader": "^2.0.0",
     "express": "^4.22.0",
     "lodash": "^4.17.21",
-    "qs": "^6.10.1",
+    "qs": "^6.15.2",
     "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {