Bump aws-cdk-lib from 2.185.0 to 2.189.1 in /backend

Bumps [aws-cdk-lib](https://github.com/aws/aws-cdk/tree/HEAD/packages/aws-cdk-lib) from 2.185.0 to 2.189.1.
- [Release notes](https://github.com/aws/aws-cdk/releases)
- [Changelog](https://github.com/aws/aws-cdk/blob/v2.189.1/CHANGELOG.v2.alpha.md)
- [Commits](https://github.com/aws/aws-cdk/commits/v2.189.1/packages/aws-cdk-lib)

---
updated-dependencies:
- dependency-name: aws-cdk-lib
  dependency-version: 2.189.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

backend/package-lock.json

@@ -42,7 +42,7 @@
     "@nestjs/platform-express": "^10.0.0",
     "@nestjs/swagger": "^7.1.13",
     "@types/jest": "^29.5.12",
-    "aws-cdk-lib": "^2.185.0",
+    "aws-cdk-lib": "^2.189.1",
     "aws-sdk": "^2.1692.0",
     "axios": "^1.8.1",
     "class-transformer": "^0.5.1",
@@ -79,7 +79,7 @@
     "@typescript-eslint/parser": "^8.30.1",
     "@vitest/coverage-v8": "^3.1.1",
     "aws-cdk": "2.139.0",
-    "aws-cdk-lib": "^2.185.0",
+    "aws-cdk-lib": "^2.189.1",
     "dotenv-cli": "^8.0.0",
     "eslint": "^8.57.0",
     "eslint-config-prettier": "^9.0.0",
@@ -97,6 +97,6 @@
     "vitest": "^3.1.1"
   },
   "peerDependencies": {
-    "aws-cdk-lib": "^2.185.0"
+    "aws-cdk-lib": "^2.189.1"
   }
 }