build(deps-dev): Bump @nestjs/testing from 11.2.3 to 12.0.1

Bumps [@nestjs/testing](https://github.com/nestjs/nest/tree/HEAD/packages/testing) from 11.2.3 to 12.0.1.
- [Release notes](https://github.com/nestjs/nest/releases)
- [Commits](https://github.com/nestjs/nest/commits/v12.0.1/packages/testing)

---
updated-dependencies:
- dependency-name: "@nestjs/testing"
  dependency-version: 12.0.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

apps/backend/package.json

@@ -84,7 +84,7 @@
     "winston": "^3.3.3"
   },
   "devDependencies": {
-    "@nestjs/testing": "^11.0.1",
+    "@nestjs/testing": "^12.0.1",
     "@swc/core": "^1.13.0",
     "@types/mock-fs": "^4.10.0",
     "mock-fs": "^5.0.0",

yarn.lock

@@ -2439,10 +2439,10 @@
   dependencies:
     path-to-regexp "8.4.2"
 
-"@nestjs/testing@^11.0.1":
-  version "11.2.3"
-  resolved "https://registry.npmjs.org/@nestjs/testing/-/testing-11.2.3.tgz#65f7c35bbaed0927193ea23a5acd90cbda59768c"
-  integrity sha512-7ANDWlkm8Xw4CYIhCNZhtBzANsQUKqjteA2yx/6sjqGyWhekeBKz8wgCJykm0vo+ltrg6U34dZlm2NgiRcNHPQ==
+"@nestjs/testing@^12.0.1":
+  version "12.0.1"
+  resolved "https://registry.yarnpkg.com/@nestjs/testing/-/testing-12.0.1.tgz#5d445da5222fb1f6d8a4180c7c43010bb2a251a6"
+  integrity sha512-prf3fsUaoKS6t04XcQt5aSTp68Po1GxUcbEBPv+3iqAef07hKQEO15r0jmmwA+rWZfONYT1UcV3YIylR++/tCg==
   dependencies:
     tslib "2.8.1"