build(deps-dev): bump dtslint from 3.6.4 to 3.6.9
build(deps-dev): bump dtslint from 3.6.4 to 3.6.9

Bumps [dtslint](https://github.com/Microsoft/dtslint) from 3.6.4 to 3.6.9.
- [Release notes](https://github.com/Microsoft/dtslint/releases)
- [Commits](https://github.com/Microsoft/dtslint/commits)

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