build(deps-dev): bump @types/postman-collection from 3.5.10 to 3.5.11

Bumps [@types/postman-collection](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/postman-collection) from 3.5.10 to 3.5.11.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/postman-collection)

---
updated-dependencies:
- dependency-name: "@types/postman-collection"
  dependency-version: 3.5.11
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

packages/backend/package.json

@@ -136,7 +136,7 @@
     "@types/js-yaml": "^4.0.9",
     "@types/mustache": "^4.2.6",
     "@types/node": "^22",
-    "@types/postman-collection": "^3.5.10",
+    "@types/postman-collection": "^3.5.11",
     "@types/supertest": "^6.0.3",
     "@types/swagger-ui-dist": "^3.30.5",
     "@types/swagger-ui-express": "^4.1.8",