Upgrade CI environment to Node 10, remove builds for < Node 8 #5314
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Issue
Per #5312, we're not getting many (any?) users of our Node 4 and 6 binary builds. In addition, #5296 requires upgrading to > Node 6 to fix some dependencies with security problems.
This PR removes builds for Node versions < 8, and switches the build environment to use Node 10 by default.
Tasklist
Requirements / Relations
Link any requirements here. Other pull requests this PR is based on?