Incompatible with built_redux 8.0.0-nullsafety.0

> Because flutter_built_redux 0.6.0 depends on built_redux >=6.1.1 <8.0.0 and app depends on built_redux 8.0.0-nullsafety.0, flutter_built_redux 0.6.0 is forbidden.

Adding a dependency override fixes it, but an update would be appreciated

```yaml
dependency_overrides:
  built_redux: 8.0.0-nullsafety.0
```