[Feature Request]: Enable larastan on level 9 (highest level)

[dmohns]

Preflight Checklist

• I have read the Contributing Guidelines for this project, if it exists.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Problem Description

This is a meta ticket tracking our progress to run larastan on level 9 https://github.com/larastan/larastan

The first milestone is reaching level 5. Code that violates up to level 5 will most likely result in failure when it gets executed in production.

Level 6 and onwards is focusing of high quality code, like ensuring type hint consistency.

Proposed Solution

see above

Alternatives Considered

see above

Additional Information

No response