[misc] Upgrade some devDeps to fix vulnerabilities

[marwahaha]

This fixes builds and upgrades to mitigate some vulnerabilities.

fixes #4776

Notes:

1. Node 10 has a current issue with the Georgian locale, documented here:
   toLocaleUpperCase() not working for Georgian locale ('ka') nodejs/node#22518
2. Grunt should be upgraded to 1.0 to solve some security vulnerabilities, but we have to get off some old plugins in order to do that.

[coveralls]

Coverage decreased (-6.5%) to 88.175% when pulling c34344f on km/vulnerabilities into 2e2a5b3 on develop.

[srl295]

As I documented above, I don't think Node is doing the wrong thing here.

Module: locale:ka Test: parse
ᲓᲔᲙᲔᲛᲑᲔᲠᲘ უნდა იყოს თვე 12

Why is it failing to parse? What are you using for your Unicode data , are you using pre-Unicode 11 tables? If so, this may be a case for tc39/ecma402#90 making Unicode properties available in ecma402. Then, you'd have access to the same Unicode version as the container. But i'm just speculating.

[srl295]

@marwahaha please don't disable the ka locale. Moment has a bug, see
#4762 (comment)

[marwahaha]

@srl295 do you have a recommendation? It sounds like there's a bug in a Unicode library, but I'd like to get other things moving on this library.

I'm happy to create another issue that (when solved/unblocked) will remove the test exceptions for ka locale.

[ashsearle]

@marwahaha / @srl295 I think it'd be good to merge this PR quickly (temporarily disabling Georgian.)

The current scenario (where Georgian fails) means every contributor faces the frustrating situation where their PR fails for reasons totally unrelated to their changes.

[marwahaha]

see #4839

[srl295]

@marwahaha it's a bug in v8. I will comment more on the follow up issue.