build(deps-dev): bump flatted from 3.0.5 to 3.1.0
build(deps-dev): bump flatted from 3.0.5 to 3.1.0

Bumps [flatted](https://github.com/WebReflection/flatted) from 3.0.5 to 3.1.0.
- [Release notes](https://github.com/WebReflection/flatted/releases)
- [Commits](https://github.com/WebReflection/flatted/compare/v3.0.5...v3.1.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
stryker-mutator/stryker,stryker-mutator/stryker,stryker-mutator/stryker