Bump version to 0.6.0

[kvinwang]

Summary

• Bump workspace package version from 0.5.11 to 0.6.0 in dstack/Cargo.toml
• Update corresponding workspace package entries in dstack/Cargo.lock

Test plan

• cargo metadata --locked succeeds after the bump
• CI green on this PR

[Copilot]

Pull request overview

Bumps the Rust workspace package version to 0.6.0 and updates the lockfile so the workspace crates reflect the new version consistently.

Changes:

• Update [workspace.package] version in dstack/Cargo.toml from 0.5.11 to 0.6.0.
• Update the corresponding workspace crate entries in dstack/Cargo.lock to 0.6.0.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
dstack/Cargo.toml	Bumps the workspace package version to 0.6.0.
dstack/Cargo.lock	Updates workspace crate versions in the lockfile to match 0.6.0.

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