Conda build fails
## Describe the bug
Current `datasets` version in conda is 1.9 instead of 1.12.

The build of the conda package fails.

Why 1.9 ?

https://anaconda.org/HuggingFace/datasets currently says 1.11 Alright I added 1.12.0 and 1.12.1 and fixed the conda build #2952 