Issue locking and unlocking APIs are now official

We're making the Issue locking and unlocking APIs part of the official GitHub API.

During the preview period you needed to provide the application/vnd.github.the-key-preview+json preview media type in the Accept header to opt-in to the new endpoints. Now that the preview period has ended, you no longer need to specify this custom media type.

If you have any questions or feedback, please get in touch with us!