Bump mongoose from 5.4.13 to 5.7.7 in /packages/overnight-server (#59)

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.4.13 to 5.7.7.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/History.md)
- [Commits](Automattic/mongoose@5.4.13...5.7.7)

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

packages/overnight-server/package.json

@@ -8,7 +8,7 @@
         "@cr/common": "0.0.2",
         "express": "4.16.4",
         "jasmine": "^3.4.0",
-        "mongoose": "5.4.13"
+        "mongoose": "5.7.7"
     },
     "scripts": {
         "start": "tsc-watch --onSuccess \"node start.js dev\" --onFailure \"echo Beep! Compilation Failed\" ",