Bump knex from 0.20.15 to 2.4.0 in /backend

Bumps [knex](https://github.com/knex/knex) from 0.20.15 to 2.4.0.
- [Release notes](https://github.com/knex/knex/releases)
- [Changelog](https://github.com/knex/knex/blob/master/CHANGELOG.md)
- [Commits](https://github.com/knex/knex/compare/0.20.15...2.4.0)

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

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

backend/package.json

@@ -16,7 +16,7 @@
 		"gravatar": "^1.8.0",
 		"json-schema-ref-parser": "^8.0.0",
 		"jsonwebtoken": "^8.5.1",
-		"knex": "^0.20.13",
+		"knex": "^2.4.0",
 		"liquidjs": "^9.11.10",
 		"lodash": "^4.17.21",
 		"moment": "^2.29.4",

docs/yarn.lock

@@ -5977,9 +5977,9 @@ loader-utils@^1.0.2, loader-utils@^1.1.0, loader-utils@^1.2.3, loader-utils@^1.4
     json5 "^1.0.1"
 
 loader-utils@^2.0.0:
-  version "2.0.4"
-  resolved "https://registry.yarnpkg.com/loader-utils/-/loader-utils-2.0.4.tgz#8b5cb38b5c34a9a018ee1fc0e6a066d1dfcc528c"
-  integrity sha512-xXqpXoINfFhgua9xiqD8fPFHgkoq1mmmpE92WlDbm9rNRd/EbRb+Gqf908T2DMfuHjjJlksiK2RbHVOdD/MqSw==
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/loader-utils/-/loader-utils-2.0.3.tgz#d4b15b8504c63d1fc3f2ade52d41bc8459d6ede1"
+  integrity sha512-THWqIsn8QRnvLl0shHYVBN9syumU8pYWEHPTmkiVGd+7K5eFNVSY6AJhRvgGF70gg1Dz+l/k8WicvFCxdEs60A==
   dependencies:
     big.js "^5.2.2"
     emojis-list "^3.0.0"