fix(deps): update dependency gcp-metadata to v3

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
gcp-metadata	dependencies	major	^2.0.0 -> ^3.0.0

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Release Notes

googleapis/gcp-metadata

v3.0.0

Compare Source

⚠ BREAKING CHANGES

• isAvailable now tries both DNS and IP, choosing whichever responds first (#​239)

Features

• isAvailable now tries both DNS and IP, choosing whichever responds first (#​239) (25bc116)

2.0.4 (2019-09-13)

Bug Fixes

• IP address takes 15 seconds to timeout, vs., metadata returning immediately (#​235) (d04207b)
• use 3s timeout rather than 15 default (#​237) (231ca5c)

2.0.3 (2019-09-12)

Bug Fixes

• use IP for metadata server (#​233) (20a15cb)

2.0.2 (2019-08-26)

Bug Fixes

• allow calls with no request, add JSON proto (#​224) (dc758b1)

2.0.1 (2019-06-26)

Bug Fixes

• docs: make anchors work in jsdoc (#​212) (9174b43)

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[nolanmar511]

LGTM pending tests.