Update duckdb index files

.gitattributes

@@ -2,3 +2,4 @@ Yehor--voa-uk-transcriptions/json-train.parquet filter=lfs diff=lfs merge=lfs -t
 Yehor--voa-uk-transcriptions/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Yehor--voa-uk-transcriptions/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
+default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f51b523c81443fa1bda26d61234b822529e929a0b159420b0443fe40a638960c
+size 50868224