Update gcp-metadata & cut new release

[djahandarie]

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Hey folks, we recently got some new logging code added to gcp-metadata in order to track down a very hard to debug issue with the metadata service on GCE returning malformed responses:

• fix: add extra logging for incorrect headers gcp-metadata#637

And it was released in gcp-metadata 7.0.0.

Would it be possible to accelerate pulling in that new dependency version and cutting a release of this nodejs code so that we can get access to the new logs in our environment?

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