Build(deps): bump axios from 1.13.2 to 1.15.0 in /backend

Bumps [axios](https://github.com/axios/axios) from 1.13.2 to 1.15.0.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v1.x/CHANGELOG.md)
- [Commits](axios/axios@v1.13.2...v1.15.0)

---
updated-dependencies:
- dependency-name: axios
  dependency-version: 1.15.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

backend/package-lock.json

@@ -31,7 +31,7 @@
     "@nestjs/schedule": "^6.1.0",
     "@nestjs/sequelize": "^11.0.0",
     "@nestjs/serve-static": "^5.0.4",
-    "axios": "^1.13.2",
+    "axios": "^1.15.0",
     "class-transformer": "^0.5.1",
     "class-validator": "^0.14.3",
     "dotenv": "^17.2.3",