chore(deps): update dependency @google-cloud/functions to v3

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@google-cloud/functions (source)	^2.0.0 -> ^3.0.0

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Release Notes

googleapis/google-cloud-node (@​google-cloud/functions)

### [`v3.0.1`](https://togithub.com/googleapis/google-cloud-node/blob/HEAD/packages/google-cloud-functions/CHANGELOG.md#301-2023-09-06) ##### Bug Fixes - \[Many APIs] simplify logic for HTTP/1.1 REST fallback option ([#​4586](https://togithub.com/googleapis/google-cloud-node/issues/4586)) ([4b18686](https://togithub.com/googleapis/google-cloud-node/commit/4b186867323b8b15469bf5e1cb890bf703b531b3)) ### [`v3.0.0`](https://togithub.com/googleapis/google-cloud-node/blob/HEAD/packages/google-cloud-functions/CHANGELOG.md#300-2023-08-06) ##### ⚠ BREAKING CHANGES - migrate to Node 14 ([#​4443](https://togithub.com/googleapis/google-cloud-node/issues/4443)) ##### Bug Fixes - \[Many APIs] fix typings for IAM methods ([#​4461](https://togithub.com/googleapis/google-cloud-node/issues/4461)) ([61bcc0a](https://togithub.com/googleapis/google-cloud-node/commit/61bcc0a89c70cf1037299eecd72aef9c98c2e666)) ##### Miscellaneous Chores - Migrate to Node 14 ([#​4443](https://togithub.com/googleapis/google-cloud-node/issues/4443)) ([2260f12](https://togithub.com/googleapis/google-cloud-node/commit/2260f12543d171bda95345e53475f5f0fdc45770))

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[dpebot]

/gcbrun