chore: bump phpstan to v1

[simPod]

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests?
2. Have you lint your code locally prior to submission?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

[icanhazstring]

Cool, thank you 🙏

[icanhazstring]

@simPod could you rebase against main?
So I can merge :)

Edit: Nevermind, worked now.
Thanks.