Bump flat and mocha

Bumps [flat](https://github.com/hughsk/flat) to 5.0.2 and updates ancestor dependency [mocha](https://github.com/mochajs/mocha). These dependencies need to be updated together.


Updates `flat` from 4.1.1 to 5.0.2
- [Release notes](https://github.com/hughsk/flat/releases)
- [Commits](https://github.com/hughsk/flat/compare/4.1.1...5.0.2)

Updates `mocha` from 7.2.0 to 10.2.0
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v7.2.0...v10.2.0)

---
updated-dependencies:
- dependency-name: flat
  dependency-type: indirect
- dependency-name: mocha
  dependency-type: direct:development
...

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

package.json

@@ -148,7 +148,7 @@
     "kleur": "^4.1.5",
     "locate-character": "^2.0.5",
     "magic-string": "^0.25.3",
-    "mocha": "^7.0.0",
+    "mocha": "^10.2.0",
     "periscopic": "^3.0.4",
     "puppeteer": "^2.0.0",
     "rollup": "^1.27.14",