chore: make extension works with node 10 by default

[lstocchi]

Followed this guide to migrate to node10 -> https://github.com/microsoft/azure-pipelines-tasks/blob/master/docs/migrateNode10.md

I also bumped the version of each task, so if someone is running with a local agent node6 they are aware of this breaking change.

[lstocchi]

LGTM but you need to modify the repo settings because seems PR is waiting for a job called Node6 to report

I think it's like that because it sees that Node6 workflow in the master but in this PR has been removed. By merging this, the issue should be solved