chore: prepare release 0.6.0-rc.4

[trustify-ci-bot]

Automated release preparation:

• Bumped workspace version to 0.6.0-rc.4
• Updated dependencies (cargo update)
• Regenerated schemas and OpenAPI spec

After merging, follow RELEASE.md for tagging.

Summary by Sourcery

Prepare the project for the 0.6.0-rc.4 release.

Enhancements:

• Prepare the workspace and API metadata for the 0.6.0-rc.4 release.

Build:

• Update locked dependency versions.

Chores:

• Regenerate the OpenAPI specification for the new release version.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Prepares the repository for the 0.6.0-rc.4 release by bumping the workspace and API version numbers and updating Cargo.lock via a dependency refresh and schema/OpenAPI regeneration.

File-Level Changes

Change	Details	Files
Bump workspace crate version for the new release candidate.	Update the workspace package version from 0.6.0-rc.3 to 0.6.0-rc.4 in the Cargo workspace manifest	Cargo.toml
Update generated OpenAPI specification to reflect new release version and regenerated schemas.	Change the documented API version from 0.6.0-rc.3 to 0.6.0-rc.4 in the OpenAPI spec Include regenerated schema/OpenAPI content corresponding to the new version (implicit in updated file)	openapi.yaml
Refresh dependency lockfile for this release and schema regeneration.	Apply cargo update results to bring dependencies and checksums up to date in the lockfile Include any transitive dependency and checksum changes associated with schema/OpenAPI regeneration	Cargo.lock

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[rh-jfuller]

LGTM