Bump mongoose from 5.13.15 to 5.13.20 in /source_code (#14)

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.13.15 to 5.13.20.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/CHANGELOG.md)
- [Commits](Automattic/mongoose@5.13.15...5.13.20)

---
updated-dependencies:
- dependency-name: mongoose
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

source_code/package-lock.json

@@ -12,7 +12,7 @@
     "ejs": "~3.1.7",
     "express": "~4.18.2",
     "http-errors": "~1.6.3",
-    "mongoose": "^5.13.15",
+    "mongoose": "^5.13.20",
     "morgan": "~1.9.1",
     "serve-favicon": "^2.5.0"
   }