chore: Update jsonschema usage

[Stranger6667]

Hey!

This PR updates the jsonschema crate and applies its newer APIs.

[apollo-cla]

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[goto-bus-stop]

That's awesome, thank you!

It looks like some of our generated definitions have naming that isn't allowed in a uri-reference anymore (things like #/definitions/apollo_router::Extendable<RouterStage>).

Does jsonschema support URL-encoded references? Should it work if we produced something like this instead?

{
  "definitions": { "apollo_router::Extendable<RouterStage>": { /* omitted */ } }
}
// elsewhere...
{
  "$ref": "#/definitions/apollo_router%3A%3AExtendable%3CRouterStage%3E"
}

[Stranger6667]

@goto-bus-stop

I think it should support them, yep :) I haven't tried it myself, though

Is there a test failure because of this?

[goto-bus-stop]

Yeah, there's a failure because the schema generated by schemars uses ,: <> characters in definitions and references. It seems that some of those characters were accepted in uri references by the old version of jsonschema we have in use at the moment, but not in the new version.
Don't worry if that's not something you want to look into, I've put it on my list so I'll take a look at patching it up on our end soon