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

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gcp-metadata	^5.0.0 -> ^6.0.0

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Release Notes

googleapis/gcp-metadata (gcp-metadata)

### [`v6.1.0`](https://togithub.com/googleapis/gcp-metadata/blob/HEAD/CHANGELOG.md#610-2023-11-10) [Compare Source](https://togithub.com/googleapis/gcp-metadata/compare/v6.0.0...v6.1.0) ##### Features - Add `universe` metadata handler ([#​596](https://togithub.com/googleapis/gcp-metadata/issues/596)) ([0c02016](https://togithub.com/googleapis/gcp-metadata/commit/0c02016756754cddde6c4402fac1ceb6a318e82d)) - Bulk Metadata Requests ([#​598](https://togithub.com/googleapis/gcp-metadata/issues/598)) ([0a51378](https://togithub.com/googleapis/gcp-metadata/commit/0a513788537173570f9910d368dd36717de7233b)) ##### Bug Fixes - Repo Metadata ([#​595](https://togithub.com/googleapis/gcp-metadata/issues/595)) ([470a872](https://togithub.com/googleapis/gcp-metadata/commit/470a8722df2b2fb2da1b076b73414d2e28a3ff4e)) ### [`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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