Update dependency google-cloud-scheduler to v2.15.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-cloud-scheduler (source)	2.14.0 -> 2.15.1

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Release Notes

googleapis/google-cloud-python (google-cloud-scheduler)

v2.15.1: google-cloud-tasks: v2.15.1

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Bug Fixes

• [google-cloud-tasks] remove BufferTask method from beta libraries, which cannot call it (23e91f5)

v2.15.0: google-cloud-tasks: v2.15.0

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Features

• Add support for python 3.12 (e9655df)
• Introduce compatibility with native namespace packages (e9655df)

Bug Fixes

• Require proto-plus >= 1.22.3 (e9655df)
• Use retry_async instead of retry in async client (e9655df)

v2.14.1: google-cloud-scheduler: v2.14.1

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Bug Fixes

• disable universe-domain validation (#​13245) (875f712)

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