save-state command is deprecated since 11th october 2022.

[Shawn8901]

Since 11th of October the save-state command the action is using is causing a deprecation warning

Warning: The 'save-state' command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
Here the changelog as clickable url:

https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The command is currently used here

cachix-action/src/main.ts

Line 82 in d035f0e

coreCommand.issueCommand('save-state', {name: 'isPost'}, 'true')

An update to a non deprecated version would be great.
As i have absolute no experience in developing actions for GH i can sadly not provide a own PR for that.

edit:
wild guess is that this method should be used: https://github.com/actions/toolkit/blob/ffb7e3e14ed5e28ae00e9c49ba02b2764d57a6b7/packages/core/src/core.ts#L352
It was changed on v1.10 which is already used by cachix-action.