build: update ts-node requirement to ^6.0.0 in /integrationTest (#703)
build: update ts-node requirement to ^6.0.0 in /integrationTest (#703)

Updates the requirements on [ts-node](https://github.com/TypeStrong/ts-node) to permit the latest version.
- [Release notes](https://github.com/TypeStrong/ts-node/releases)
- [Commits](https://github.com/TypeStrong/ts-node/commits/v6.0.0)

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