/home/runner/work/notify-slack-action/notify-slack-action/./action.yml (Line: 12, Col: 14): Unrecognized named-value: 'vars'. Located at position 1 within expression: vars.SLACK_INTEGRATION_TEST_CHANNEL_ID

GitHub.DistributedTask.ObjectTemplating.TemplateValidationException: The template is not valid. /home/runner/work/notify-slack-action/notify-slack-action/./action.yml (Line: 12, Col: 14): Unrecognized named-value: 'vars'. Located at position 1 within expression: vars.SLACK_INTEGRATION_TEST_CHANNEL_ID at GitHub.DistributedTask.ObjectTemplating.TemplateValidationErrors.Check() at GitHub.Runner.Worker.ActionManifestManager.ConvertRuns(IExecutionContext executionContext, TemplateContext templateContext, TemplateToken inputsToken, String fileRelativePath, MappingToken outputs) at GitHub.Runner.Worker.ActionManifestManager.Load(IExecutionContext executionContext, String manifestFile)