Bump loopback from 2.26.2 to 3.25.1

Bumps [loopback](https://github.com/strongloop/loopback) from 2.26.2 to 3.25.1.
- [Release notes](https://github.com/strongloop/loopback/releases)
- [Changelog](https://github.com/strongloop/loopback/blob/master/CHANGES.md)
- [Commits](strongloop/loopback@v2.26.2...v3.25.1)

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

Author: dependabot[bot]

package.json

@@ -24,7 +24,7 @@
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-standard": "^4.0.1",
-    "loopback": "2.26.2",
+    "loopback": "3.25.1",
     "mocha": "^8.1.3",
     "prettier": "^2.1.2"
   },