`pext/yotta:latest` image type has been deprecated and stopped working with latest docker

Trying to build Makecode with Docker v26+ fails, as trying to pull the pext/yotta:latest image (for the V2 CODAL build) throws the following error:

$ docker pull pext/yotta:latest
latest: Pulling from pext/yotta
[DEPRECATION NOTICE] Docker Image Format v1 and Docker Image manifest version 2, schema 1 support is disabled by default and will be removed in an upcoming release. Suggest the author of docker.io/pext/yotta:latest to upgrade the image to the OCI Format or Docker Image manifest v2, schema 2. More information at https://docs.docker.com/go/deprecated-image-specs/

https://github.com/microsoft/pxt-microbit/blob/bd4bda19f33ba30ea61e3620c8fa069b8306d07e/pxtarget.json#L204-L207

This docker image type was deprecated in Docker v19, it has been disabled already in v26, and v27 (which was release a couple of weeks ago) has completely and permanently removed the functionality:
https://docs.docker.com/engine/deprecated/#pushing-and-pulling-with-image-manifest-v2-schema-1

The GH Actions runner images (which we use in the CODAL CI to test changes with a MakeCode build) currently use Docker v26, which needs a workaround to enable this image type, but it won't be long before they upgrade to v27 and things will stop working if there isn't a way to downgrade the docker version from the images.