fix: update dependency @google-cloud/secret-manager to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@google-cloud/secret-manager (source)	5.6.0 -> 6.1.1

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Release Notes

googleapis/google-cloud-node (@​google-cloud/secret-manager)

v6.1.1

Bug Fixes

• [gkeconnect-gateway] remove unused GatewayServiceClient (#​6775) (41c2ff2)
• Remove unmaintained modules (#​6789) (5540190)

v6.1.0

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 (#​6423) (df9184f)
• [secretmanager] update secret manager protos for tags (#​6400) (b41f79d)
• Add protobufjs 2023 edition support (#​6303) (4a0cba1)

v6.0.1

Bug Fixes

• [Many APIs] await/catch promises, and update listOperationsAsync return type (#​6188) (a73cdbf)

v6.0.0

⚠ BREAKING CHANGES

• upgrade to Node 18 (#​6096)

Features

• [Many APIs] add request/response debug logging to gapics (b99c5f8)

Miscellaneous Chores

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

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