chore(deps): bump @aws-sdk/client-sts in /backend

Bumps [@aws-sdk/client-sts](https://github.com/aws/aws-sdk-js-v3/tree/HEAD/clients/client-sts) from 3.726.1 to 3.908.0.
- [Release notes](https://github.com/aws/aws-sdk-js-v3/releases)
- [Changelog](https://github.com/aws/aws-sdk-js-v3/blob/main/clients/client-sts/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js-v3/commits/v3.908.0/clients/client-sts)

---
updated-dependencies:
- dependency-name: "@aws-sdk/client-sts"
  dependency-version: 3.908.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/package.json

@@ -18,7 +18,7 @@
         "typeorm": "typeorm-ts-node-commonjs"
     },
     "dependencies": {
-        "@aws-sdk/client-sts": "3.726.1",
+        "@aws-sdk/client-sts": "3.908.0",
         "@google-cloud/local-auth": "^3.0.1",
         "@nestjs/common": "^10.4.7",
         "@nestjs/config": "^4.0.2",