Bump bcrypt from 5.1.1 to 6.0.0 in /backend

Bumps [bcrypt](https://github.com/kelektiv/node.bcrypt.js) from 5.1.1 to 6.0.0.
- [Release notes](https://github.com/kelektiv/node.bcrypt.js/releases)
- [Changelog](https://github.com/kelektiv/node.bcrypt.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kelektiv/node.bcrypt.js/compare/v5.1.1...v6.0.0)

---
updated-dependencies:
- dependency-name: bcrypt
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

backend/package.json

@@ -16,7 +16,7 @@
 		"ajv": "^8.17.1",
 		"archiver": "^5.3.0",
 		"batchflow": "^0.4.0",
-		"bcrypt": "^5.0.0",
+		"bcrypt": "^6.0.0",
 		"body-parser": "^1.20.3",
 		"compression": "^1.7.4",
 		"express": "^5.2.1",