John Blackbourn cf6026d64d Build/Test tools: Switch npm dependency caching strategy on Travis CI.
This switches to caching npm's local cache instead of `node_modules` in order to prevent issues caused by modules compiled using a different version of node.

See #46632


git-svn-id: https://develop.svn.wordpress.org/trunk@44993 602fd350-edb4-49c9-b593-d223f7449a82
2019-03-25 00:51:12 +00:00
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