fix(deps): update dependency @google-cloud/promisify to v3

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@google-cloud/promisify	^2.0.0 -> ^3.0.0

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Release Notes

googleapis/nodejs-promisify

v3.0.0

Compare Source

⚠ BREAKING CHANGES

• drop node 10 from engines list, update typescript to 4.6.3 (#​300)

Build System

• drop node 10 from engines list, update typescript to 4.6.3 (#​300) (fed2f14)

2.0.4 (2021-09-09)

Bug Fixes

• build: switch primary branch to main (#​270) (11242f7)

2.0.3 (2020-09-04)

Bug Fixes

• allow excluding accessor methods (#​228) (114d8bc)

2.0.2 (2020-07-06)

Bug Fixes

• update node issue template (#​204) (a2ba8d8)

2.0.1 (2020-05-08)

Bug Fixes

• apache license URL (#​468) (#​191) (0edc724)

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