Generator-jhipster: The generator project - Deprecate node v8 versions

[MathieuAA]

Overview of the feature request

Node v8 is not longer supported, and node v10 is in maintenance mode (v12 being the LTS version).

Motivation for or Use Case

First motivation: we can use the newer features of node (mkdir('p', ...)), bump (I'm talking semver-major updates) some dependencies.
Second motivation: JCore is gonna do the same.
Third motivation: remove the mkdirp dependency, because it won't be needed anymore.

Related issues or PR

Didn't find any.

• [X] Yes, I do solemnly swear that I've read everything.

[SudharakaP]

This pertains to the templates/package.json.ejs files right (example) ? I think we can safely do this since our CI already runs on Node 12.

* [x]  Yes, I do solemnly swear that I've read everything.

:smile: :smile:

[MathieuAA]

@SudharakaP I should have added this little detail: I was talking about the generator.

[SudharakaP]

@SudharakaP I should have added this little detail: I was talking about the generator.

No problem. I think the previous PR is still valid since we need to upgrade the template version as well to 12 anyways. :smile:

[MathieuAA]

Indeed!