fix: updating ancestry config name

config/step/gwas_catalog.yaml

@@ -1,6 +1,6 @@
 _target_: otg.gwas_catalog.GWASCatalogStep
 catalog_study_files: ${datasets.catalog_studies}
-catalog_ancestry_file: ${datasets.catalog_ancestries}
+catalog_ancestry_files: ${datasets.catalog_ancestries}
 catalog_associations_file: ${datasets.catalog_associations}
 catalog_sumstats_lut: ${datasets.catalog_sumstats_lut}
 variant_annotation_path: ${datasets.variant_annotation}