Dependabot alerts: access state, fixed alerts, and numeric identifier via GraphQL API

This release adds support for viewing fixed alerts to the GraphQL API. This update also adds the ability to access and filter by state, as well as access unique numeric identifier.

The additions include these new fields to a RepositoryVulnerabilityAlert:

• number
• fixed_at
• fix_reason
• state

And we're adding the ability to filter by state on the vulnerability alert object.

For more information, see Dependabot alerts in the GraphQL API reference.