fix(database): use correct return type for IsDatabaseModel::resolve

[brendt]

No description provided.

[brendt]

PhpStorm complains of self is used in a trait while the interface defines static. Making this change makes PHPStan complain, which I then suppresed. I think it's more important to have accurate realtime IDE support

[github-actions]

Benchmark Results

Comparison of is-database-model-correct-return-type against 3.x (452e201d6fc8a3994d3f987f0fbec3f6a743edd1).

Open to see the benchmark results

No benchmark changes above ±5%.

_{Generated by phpbench against commit f5b4abc}