Bump archiver

[delivers #79748612]

Bump pivotal-golang/archiver:
  Amit Gupta:
     Test that tar compression respects symlinks ( Travis Success: https://travis-ci.org/pivotal-golang/archiver/builds/36697317 )
     Remove windows conditionals from tests, and support symlinks in zips ( Travis Unknown )
  Alex Suraci:
     Shell out to tar when available for extraction [#79748612] ( Travis Unknown )