Tighter version constraints on exported packages

[nex3]

Per the new exported dependency guidelines, the dependency constraints for di should be narrowed to >=3.3.2 <3.3.3 and route_hierarchical to >=0.6.1 <0.6.2.

[naomiblack]

This seems nice to have, but we also need to add some automation to the CI tests to check against new versions.