Bump flat from 5.0.2 to 6.0.1

Bumps [flat](https://github.com/hughsk/flat) from 5.0.2 to 6.0.1.
- [Release notes](https://github.com/hughsk/flat/releases)
- [Commits](hughsk/flat@5.0.2...v6.0.1)

---
updated-dependencies:
- dependency-name: flat
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -38,7 +38,7 @@
     "classnames": "^2.3.2",
     "core-js": "^3.33.0",
     "draftjs-to-html": "^0.9.1",
-    "flat": "^5.0.2",
+    "flat": "^6.0.1",
     "lexical": "^0.12.6",
     "path-to-regexp": "^6.2.1",
     "prop-types": "^15.8.1",