Confusing behavior when using older version of dandischema

When using a version of dandischema that's behind `DANDI_SCHEMA_VERSION`, the local schema is not used, but rather the schema is fetched from dandischema releases. The code shown below is where this occurs

https://github.com/dandi/dandi-schema/blob/6e994623929db23099764de2ab796291305fa57c/dandischema/metadata.py#L174-L187

This is rather confusing behavior if you're relying on modifications to the local schema, like [using localhost urls](https://github.com/dandi/dandi-schema/pull/128), since the schema that is used for validation will be independent of any changes you have. Is there some way this can be improved?