fix(deps): update dependency gcp-metadata to v6 - autoclosed

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gcp-metadata	^5.3.0 -> ^6.0.0

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Release Notes

googleapis/gcp-metadata (gcp-metadata)

### [`v6.0.0`](https://togithub.com/googleapis/gcp-metadata/blob/HEAD/CHANGELOG.md#600-2023-07-17) [Compare Source](https://togithub.com/googleapis/gcp-metadata/compare/v5.3.0...v6.0.0) ##### ⚠ BREAKING CHANGES - upgrade to Node 14, and update gaxios, ts, and gts ([#​571](https://togithub.com/googleapis/gcp-metadata/issues/571)) ##### Miscellaneous Chores - Upgrade to Node 14, and update gaxios, ts, and gts ([#​571](https://togithub.com/googleapis/gcp-metadata/issues/571)) ([88ff3ff](https://togithub.com/googleapis/gcp-metadata/commit/88ff3ff3d9bd8be32126e7fe76cbf33e401f8db7))

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