Bump flatted from 3.3.1 to 3.4.2 in /landing

Bumps [flatted](https://github.com/WebReflection/flatted) from 3.3.1 to 3.4.2.
- [Commits](https://github.com/WebReflection/flatted/compare/v3.3.1...v3.4.2)

---
updated-dependencies:
- dependency-name: flatted
  dependency-version: 3.4.2
  dependency-type: indirect
...

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

landing/package-lock.json

@@ -2969,9 +2969,10 @@
       }
     },
     "node_modules/flatted": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.3.1.tgz",
-      "integrity": "sha512-X8cqMLLie7KsNUDSdzeN8FYK9rEt4Dt67OsG/DNGnYTSDBG4uFAJFBnUeiV+zCVAvwFy56IjM9sH51jVaEhNxw=="
+      "version": "3.4.2",
+      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.4.2.tgz",
+      "integrity": "sha512-PjDse7RzhcPkIJwy5t7KPWQSZ9cAbzQXcafsetQoD7sOJRQlGikNbx7yZp2OotDnJyrDcbyRq3Ttb18iYOqkxA==",
+      "license": "ISC"
     },
     "node_modules/for-each": {
       "version": "0.3.3",