Bump validator from 13.12.0 to 13.15.20

Bumps [validator](https://github.com/validatorjs/validator.js) from 13.12.0 to 13.15.20.
- [Release notes](https://github.com/validatorjs/validator.js/releases)
- [Changelog](https://github.com/validatorjs/validator.js/blob/master/CHANGELOG.md)
- [Commits](validatorjs/validator.js@13.12.0...13.15.20)

---
updated-dependencies:
- dependency-name: validator
  dependency-version: 13.15.20
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -56,7 +56,7 @@
         "swagger-autogen": "^2.19.0",
         "swagger-ui-express": "^4.3.0",
         "uuid": "^8.3.2",
-        "validator": ">=13.7.0",
+        "validator": ">=13.15.20",
         "winston": "^3.2.1",
         "yamljs": "^0.3.0"
     },