Bump config and @types/config in /backend

Bumps [config](https://github.com/node-config/node-config) and [@types/config](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/config). These dependencies needed to be updated together.

Updates `config` from 3.3.9 to 3.3.11
- [Release notes](https://github.com/node-config/node-config/releases)
- [Changelog](https://github.com/node-config/node-config/blob/master/History.md)
- [Commits](node-config/node-config@v3.3.9...v3.3.11)

Updates `@types/config` from 3.3.2 to 3.3.4
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/config)

---
updated-dependencies:
- dependency-name: config
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: "@types/config"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

backend/package.json

@@ -35,7 +35,7 @@
     "chalk": "^5.2.0",
     "clamscan": "^2.2.1",
     "cls-hooked": "^4.2.2",
-    "config": "^3.3.9",
+    "config": "^3.3.11",
     "connect-mongo": "^5.1.0",
     "content-disposition": "^0.5.4",
     "dedent-js": "^1.0.1",
@@ -72,7 +72,7 @@
     "@types/bunyan": "^1.8.11",
     "@types/clamscan": "^2.0.8",
     "@types/cls-hooked": "^4.3.8",
-    "@types/config": "^3.3.2",
+    "@types/config": "^3.3.4",
     "@types/express": "^4.17.21",
     "@types/jsonwebtoken": "^9.0.6",
     "@types/lodash-es": "^4.17.10",