Bump marked and @types/marked in /src/backend

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

Updates `marked` from 5.0.1 to 5.1.1
- [Release notes](https://github.com/markedjs/marked/releases)
- [Changelog](https://github.com/markedjs/marked/blob/master/.releaserc.json)
- [Commits](markedjs/marked@v5.0.1...v5.1.1)

Updates `@types/marked` from 4.0.7 to 5.0.1
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/marked)

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

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

src/backend/package.json

@@ -41,7 +41,7 @@
     "dotenv": "16.0.2",
     "express": "4.18.1",
     "keycloak-connect": "18.0.2",
-    "marked": "5.0.1",
+    "marked": "5.1.1",
     "morgan": "1.10.0",
     "nest-keycloak-connect": "1.9.0",
     "pg": "8.8.0",
@@ -58,7 +58,7 @@
     "@nestjs/testing": "9.2.1",
     "@types/express": "4.17.13",
     "@types/jest": "28.1.8",
-    "@types/marked": "4.0.7",
+    "@types/marked": "5.0.1",
     "@types/node": "16.0.0",
     "@types/pug": "2.0.6",
     "@types/supertest": "2.0.11",