proposal: Issue closing reason `state_reason`

[peaceiris]

Checklist

• [X] I am using the latest version of this action.
• [X] I have read the latest README and followed the instructions.
• [X] I have read the latest GitHub Actions official documentation and learned the basic spec and concepts.

Describe your proposal

Support closing an issue with a reason.

Describe the solution you'd like

Add a new key state_reason to the issue object.

Describe alternatives you've considered

No response

Additional context

• The new GitHub Issues - May 19th update | GitHub Changelog
• Not found page about this in the official docs

[ayamebot]

Hi, there.

Thank you @peaceiris for suggesting this.

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