Release v0.2.0

Enhancements

• Support validating a single workflow.
• Support validating a single job in a workflow.
• Make ghasum update error if the gha.sum file is corrupted.

Bugs

• Unlock gha.sum if an error occurs during updating.
• Correct parsing uses values with multiple @ characters.

Security

• Upgrade from Go 1.22.0 to Go 1.22.1