Bump flat from 4.1.1 to 5.0.1

Bumps [flat](https://github.com/hughsk/flat) from 4.1.1 to 5.0.1.
- [Release notes](https://github.com/hughsk/flat/releases)
- [Commits](hughsk/flat@4.1.1...5.0.1)

---
updated-dependencies:
- dependency-name: flat
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -75,7 +75,7 @@
     "bottlejs": "^1.7.1",
     "bs58": "^4.0.1",
     "dotenv": "^8.6.0",
-    "flat": "^4.1.0",
+    "flat": "^5.0.1",
     "json-schema-traverse": "^1.0.0",
     "lodash": "^4.17.21",
     "merkle-tools": "^1.4.1",