chore(deps): bump @nestjs/core from 11.1.12 to 11.1.28 in /backend

Bumps [@nestjs/core](https://github.com/nestjs/nest/tree/HEAD/packages/core) from 11.1.12 to 11.1.28.
- [Release notes](https://github.com/nestjs/nest/releases)
- [Commits](https://github.com/nestjs/nest/commits/v11.1.28/packages/core)

---
updated-dependencies:
- dependency-name: "@nestjs/core"
  dependency-version: 11.1.27
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

backend/package.json

@@ -30,7 +30,7 @@
         "@nest-lab/throttler-storage-redis": "^1.1.0",
         "@nestjs/common": "^11.1.17",
         "@nestjs/config": "^4.0.2",
-        "@nestjs/core": "^11.1.26",
+        "@nestjs/core": "^11.1.28",
         "@nestjs/jwt": "^11.0.2",
         "@nestjs/mapped-types": "^2.1.0",
         "@nestjs/passport": "^11.0.5",