build(deps): bump immutable from 5.1.6 to 5.1.9 in /frontend

Bumps [immutable](https://github.com/immutable-js/immutable-js) from 5.1.6 to 5.1.9.
- [Release notes](https://github.com/immutable-js/immutable-js/releases)
- [Changelog](https://github.com/immutable-js/immutable-js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/immutable-js/immutable-js/compare/v5.1.6...v5.1.9)

---
updated-dependencies:
- dependency-name: immutable
  dependency-version: 5.1.9
  dependency-type: indirect
...

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

frontend/package-lock.json

@@ -1424,9 +1424,9 @@
       }
     },
     "node_modules/immutable": {
-      "version": "5.1.6",
-      "resolved": "https://registry.npmjs.org/immutable/-/immutable-5.1.6.tgz",
-      "integrity": "sha512-q1swsS8K7L8usSHuOqF2TAoCCkonYz0SG38wLAggaa4Wml70zixIvt2ql4coQ2C2B3hTjltJry4r6bULwgAXLQ==",
+      "version": "5.1.9",
+      "resolved": "https://registry.npmjs.org/immutable/-/immutable-5.1.9.tgz",
+      "integrity": "sha512-m8nVez3rwrgmWxtLMt1ZYXB2Lv7OKYn/disyxAlSDYAlKSlFoPPfIAmAM/M5xqL4m4C/wAPw7S2/CNaUii1Hxg==",
       "license": "MIT"
     },
     "node_modules/is-extglob": {