Bump grunt-pipe from ddb1d70 to 6002f64 (#135)

Bumps [grunt-pipe](https://github.com/RobotWebTools/grunt-pipe) from `ddb1d70` to `6002f64`.
- [Release notes](https://github.com/RobotWebTools/grunt-pipe/releases)
- [Commits](RobotWebTools/grunt-pipe@ddb1d70...6002f64)

---
updated-dependencies:
- dependency-name: grunt-pipe
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>