Bump flat from 4.1.0 to 5.0.0

Bumps [flat](https://github.com/hughsk/flat) from 4.1.0 to 5.0.0.
- [Release notes](https://github.com/hughsk/flat/releases)
- [Commits](hughsk/flat@4.1.0...5.0.0)

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

Author: dependabot-preview[bot]

package.json

@@ -29,7 +29,7 @@
     "test": "jest"
   },
   "dependencies": {
-    "flat": "^4.1.0",
+    "flat": "^5.0.0",
     "lodash": "^4.17.11"
   },
   "devDependencies": {