Bump flatted from 3.2.9 to 3.4.2 in /demo/frontend

Bumps [flatted](https://github.com/WebReflection/flatted) from 3.2.9 to 3.4.2.
- [Commits](https://github.com/WebReflection/flatted/compare/v3.2.9...v3.4.2)

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

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

demo/frontend/yarn.lock

@@ -2223,9 +2223,9 @@ flat-cache@^3.0.4:
     rimraf "^3.0.2"
 
 flatted@^3.2.9:
-  version "3.2.9"
-  resolved "https://registry.yarnpkg.com/flatted/-/flatted-3.2.9.tgz#7eb4c67ca1ba34232ca9d2d93e9886e611ad7daf"
-  integrity sha512-36yxDn5H7OFZQla0/jFJmbIKTdZAQHngCedGxiMmpNfEZM0sdEeT+WczLQrjK6D7o2aiyLYDnkw0R3JK0Qv1RQ==
+  version "3.4.2"
+  resolved "https://registry.yarnpkg.com/flatted/-/flatted-3.4.2.tgz#f5c23c107f0f37de8dbdf24f13722b3b98d52726"
+  integrity sha512-PjDse7RzhcPkIJwy5t7KPWQSZ9cAbzQXcafsetQoD7sOJRQlGikNbx7yZp2OotDnJyrDcbyRq3Ttb18iYOqkxA==
 
 for-each@^0.3.3:
   version "0.3.3"