Merge branch 'support-finetuning' into 'main'

Bump `arkindex-base-worker` to `0.3.7rc3`

See merge request workers/generic-training-dataset!21

.arkindex.yml

 ---
 version: 2
 
-type: worker
-
 workers:
   - slug: generic-training-dataset
     name: Generic Training Dataset Extractor

requirements.txt

-arkindex-base-worker==0.3.6
+arkindex-base-worker==0.3.7rc3
 arkindex-export==0.1.9