Don't use RefResolver

[gadomski]

As of jsonschema v4.18, RefResolver is deprecated:

DeprecationWarning: jsonschema.RefResolver is deprecated as of v4.18.0, in favor of the https://github.com/python-jsonschema/referencing library, which provides more compliant referencing behavior as well as more flexible APIs for customization. A future release will remove RefResolver. Please file a feature request (on referencing) if you are missing an API for the kind of customization you need.

This issue is to track the need to update to The New Way.

[vincentsarago]

FYI I'm getting some errors in titiler CI with the latest jsonschema developmentseed/titiler#664 (comment)

[gadomski]

Thanks for the report Vincent! I wonder if we should ceil jsonschema below v4.18 for the time being? What's your sense of how broken things are over there?

[vincentsarago]

Yep that's what I did in #1189 😅

What's your sense of how broken things are over there?

I have no idea, it's weird that they broke something in a patch release. I'm pretty sure this was unintentional but knowing it's deprecated I feel it's safer to set an upper bound to the requirement so one they do remove it pystac should continue working

[gadomski]

#1189 is released in v1.8.2.

[jsignell]

I'm going to look into this a bit today to see if the timing is right to pick it up

[2320sharon]

Hi @jsignell, thank you for addressing this issue. It's blocking the resolution of #1214, which is affecting Jupyter Lab in downstream applications. We truly appreciate your efforts!