Not possible to save Linear settings in alert

### Environment SaaS (https://sentry.io/) ### Steps to Reproduce 1. Create an alert in an org that has Linear integration 2. click on "Settings" at the _Then step, create a Linear issue with these Settings_ part 3. Modify the Linear settings 4. Hit Save 5. Open the settings again and the previously added settings are blank again ### Expected Result The settings should be saved ### Actual Result The settings are not saved https://github.com/getsentry/sentry/assets/25980868/1096592d-511d-47fd-8b6a-a3d61401fee2 ### Product Area Settings - Integrations ### Link _No response_ ### DSN _No response_ ### Version _No response_