Update dependency @types/node to v20 (#64)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/node) ([source](https://github.com/DefinitelyTyped/DefinitelyTyped)) | devDependencies | major | [`^18.0.0` -> `^20.0.0`](https://renovatebot.com/diffs/npm/@types%2fnode/18.16.13/20.5.9) |

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Reviewed-on: https://gitea.vylpes.xyz/RabbitLabs/random-bunny/pulls/64
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package.json

@@ -36,7 +36,7 @@
   "devDependencies": {
     "@types/eslint": "^8.21.1",
     "@types/jest": "^29.4.0",
-    "@types/node": "^18.0.0",
+    "@types/node": "^20.0.0",
     "@typescript-eslint/eslint-plugin": "^5.54.0",
     "@typescript-eslint/parser": "^5.54.0",
     "eslint": "^8.35.0",