Bump flat from 4.1.0 to 5.0.2
Bumps [flat](https://github.com/hughsk/flat) from 4.1.0 to 5.0.2.
- [Release notes](https://github.com/hughsk/flat/releases)
- [Commits](https://github.com/hughsk/flat/compare/4.1.0...5.0.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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