build(deps): bump react-datepicker from 7.6.0 to 8.4.0 in /apps/OpenSign

Bumps [react-datepicker](https://github.com/Hacker0x01/react-datepicker) from 7.6.0 to 8.4.0.
- [Release notes](https://github.com/Hacker0x01/react-datepicker/releases)
- [Commits](Hacker0x01/react-datepicker@v7.6.0...v8.4.0)

---
updated-dependencies:
- dependency-name: react-datepicker
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

apps/OpenSign/package-lock.json

@@ -27,7 +27,7 @@
     "react-bootstrap": "^2.10.9",
     "react-confetti": "^6.4.0",
     "react-cookie": "^7.2.2",
-    "react-datepicker": "^7.6.0",
+    "react-datepicker": "^8.4.0",
     "react-dnd": "^16.0.1",
     "react-dnd-html5-backend": "^16.0.1",
     "react-dnd-multi-backend": "^9.0.0",