Bump bcrypt from 3.0.6 to 5.0.0

Bumps [bcrypt](https://github.com/kelektiv/node.bcrypt.js) from 3.0.6 to 5.0.0.
- [Release notes](https://github.com/kelektiv/node.bcrypt.js/releases)
- [Changelog](https://github.com/kelektiv/node.bcrypt.js/blob/master/CHANGELOG.md)
- [Commits](kelektiv/node.bcrypt.js@v3.0.6...v5.0.0)

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

Author: dependabot[bot]

package-lock.json

@@ -4,7 +4,7 @@
   "main": "server.js",
   "dependencies": {
     "@zeit/next-css": "^1.0.1",
-    "bcrypt": "^3.0.6",
+    "bcrypt": "^5.0.0",
     "body-parser": "^1.18.3",
     "chart.js": "^2.8.0",
     "chartjs": "^0.3.24",