build(deps-dev): bump @types/node from 18.15.3 to 20.4.1 in /backend

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 18.15.3 to 20.4.1.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

---
updated-dependencies:
- dependency-name: "@types/node"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

backend/package.json

@@ -11,7 +11,7 @@
   },
   "devDependencies": {
     "@faker-js/faker": "^7.6.0",
-    "@types/node": "^18.15.3",
+    "@types/node": "^20.4.1",
     "@types/tap": "^15.0.8",
     "prisma": "4.11.0",
     "sinon": "^15.0.2",

backend/yarn.lock

@@ -720,10 +720,10 @@
   resolved "https://registry.yarnpkg.com/@types/js-yaml/-/js-yaml-4.0.5.tgz#738dd390a6ecc5442f35e7f03fa1431353f7e138"
   integrity sha512-FhpRzf927MNQdRZP0J5DLIdTXhjLYzeUTmLAu69mnVksLH9CJY3IuSeEgbKUki7GQZm0WqDkGzyxju2EZGD2wA==
 
-"@types/node@*", "@types/node@^18.15.3":
-  version "18.15.3"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-18.15.3.tgz#f0b991c32cfc6a4e7f3399d6cb4b8cf9a0315014"
-  integrity sha512-p6ua9zBxz5otCmbpb5D3U4B5Nanw6Pk3PPyX05xnxbB/fRv71N7CPmORg7uAD5P70T0xmx1pzAx/FUfa5X+3cw==
+"@types/node@*", "@types/node@^20.4.1":
+  version "20.4.1"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-20.4.1.tgz#a6033a8718653c50ac4962977e14d0f984d9527d"
+  integrity sha512-JIzsAvJeA/5iY6Y/OxZbv1lUcc8dNSE77lb2gnBH+/PJ3lFR1Ccvgwl5JWnHAkNHcRsT0TbpVOsiMKZ1F/yyJg==
 
 "@types/prop-types@*":
   version "15.7.5"