fix(deps): update dependency gcp-metadata to ^0.7.0

[renovate]

This Pull Request updates dependency gcp-metadata from ^0.6.3 to ^0.7.0

Release Notes

v0.7.0

Compare Source
This is a re-release of v0.6.5 (which was unpublished) as a semver major
(v0.7.0). The potentially breaking change is how we deal with unexpected errors
in the isAvailable function. Previously unexpected errors would be swallowed,
but now they get thrown.

Notable Changes

• 2d34f9d fix: do not swallow unexpected errors (#​57)

Other commits

Since 0.6.3:

• 5e74a0e refactor: use mocha instead of ava (#​63)
• 475081e build: fix typo in publish step (#​59)
• 89ebf0f chore(deps): update dependency nyc to v12 (#​53)
• 3cb8173 chore(deps): update dependency gts to ^0.7.0 (#​55)
• f18fab2 docs: document isAvailable method (#​52)
• 1da2e85 chore: update to the latest version of all dependencies (#​51)
• 4305f3f docs: add a few things to the readme (#​50)
• e1d448d chore(build): test node10, separate lint job (#​49)
• 360474f Update renovate.json

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