pin schema version instead of `pystac` version

[emmaai]

Currently eodatasets pin pystac<1.2 to ensure the compatibility of schema, while pystac supports a list of schema versions. Wondering if the behaviour can be changed from "getting latest version of schema supported by pystac" to "getting certain version of schema supported by the latest pystac"? to be specific:
current behaviour (to mimic)

from pystac.extensions.projection import ProjectionExtension
schema_uri = ProjectionExtension.get_schema_uri()
print(schema_uri)

output
https://stac-extensions.github.io/projection/v1.1.0/schema.json

changed behaviour (to mimic)

schema_uris = ProjectionExtension.get_schema_uris()
for uri in schema_uris:
    print(uri)

output

https://stac-extensions.github.io/projection/v1.0.0/schema.json
https://stac-extensions.github.io/projection/v1.1.0/schema.json

Then eodatasets can choose which specific version of schema to support. I'm not sure if there are other considerations involved with pystac<1.2 in addition to schema versions. Though I'd like to access other data with different stac schema versions with eodatasets playing along.