`aind-data-schema-models` is pinned to <6 but current version is 6.1.0

[dougollerenshaw]

As stated in the title, aind-data-schema-models is pinned to <6 here but current version is 6.1.0.

I was hoping to take advantage of this PR, but the version pin prevents that.

[dougollerenshaw]

@dbirman to solve whenever he does the next release