chore(deps): update dependency @google-cloud/functions to v4

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
@google-cloud/functions (source)	^3.0.0 -> ^4.0.0

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Release Notes

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

v4.2.1

Bug Fixes

• [gkeconnect-gateway] remove unused GatewayServiceClient (#​6775) (41c2ff2)

v4.2.0

Features

• [Many APIs] add methods from gax to cache proto root and process custom error details (#​6419) (f8a324c)
• [Many APIs] add methods from gax to cache proto root and process custom error details (#​6420) (fe8d6cc)
• Add protobufjs 2023 edition support (#​6303) (4a0cba1)

v4.1.0

Features

• Add protobufjs 2023 edition support (b3bd921)

v4.0.1

Bug Fixes

• [Many APIs] await/catch promises, and update listOperationsAsync return type (#​6185) (ab30412)

v4.0.0

⚠ BREAKING CHANGES

• upgrade to Node 18 (#​6096)

Features

• [Many APIs] add request/response debug logging to gapics (afcb5c0)

Miscellaneous Chores

• Upgrade to Node 18 (#​6096) (eadae64)

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[dpebot]

/gcbrun