fix: upgrade mongoose from 5.9.12 to 5.9.13

Snyk has created this PR to upgrade mongoose from 5.9.12 to 5.9.13.

See this package in NPM:
https://www.npmjs.com/package/mongoose

See this project in Snyk:
https://app.snyk.io/org/svenwesterlaken/project/fb5a073e-fb45-40d8-b486-4950468e8c4e?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -50,7 +50,7 @@
   },
   "dependencies": {
     "lodash": "^4.17.15",
-    "mongoose": "^5.9.12",
+    "mongoose": "^5.9.13",
     "neo4j-driver": "^4.0.2",
     "parse-neo4j": "^0.6.11",
     "pluralize": "^8.0.0"