chore(deps): update dependency @google-cloud/functions to v2

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@google-cloud/functions	^1.3.0 -> ^2.0.0

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[dpebot]

/gcbrun

[dpebot]

/gcbrun

[dpebot]

/gcbrun