deps: upgrade npm to 3.8.6

Checklist

• tests and code linting passes
• a test and/or benchmark is included
• documentation is changed or added
• the commit message follows commit guidelines

Affected core subsystem(s)

• deps

Description of change

Hey y'all! I took care of this release while @iarna was out, so I'm doing the downstream for this one.

This PR includes the following releases:

• https://github.com/npm/npm/releases/tag/v3.8.4
• https://github.com/npm/npm/releases/tag/v3.8.5
• https://github.com/npm/npm/releases/tag/v3.8.6

Notable Changes

• 0d4a0b1 #11442 Fail if the user asks us to make a link from a module back on to itself. (@antialias)
• b271ed2 #11983 Exit early if no arguments were provided to search instead of trying to display all the modules, running out of memory, and then crashing. (@SimenB)
• f8fb4d8 #12079 Back in npm@3.2.2 we included a patch that made it so npm install pkg was basically npm install pkg@latest instead of pkg@* This is probably what most users expected, but it also ended up breaking npm deprecate when no version was provided for a package. In that case, we were using * to mean "deprecate all versions" and relying on the pkg -> pkg@* conversion. This patch fixes npm deprecate pkg to work as it used to by special casing that particular command's behavior. (@polm)
• 3e41360 #11987 Fix test that was inappropriately hitting the network (@yodeyer)
• I added an extra hotfix to this PR, which is over at https://github.com/npm/npm/pull/12310 on the npm side, because our test-node script was still trying to invoke the legacy tests (which are now regular tests).
• Various dependency and documentation updates.

You can see the full release notes at .

r: @iarna r: @Fishrock123 r: @TheAlphaNerd