Update duckdb index files

.gitattributes

@@ -79,3 +79,4 @@ transcribe_ro/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 translate_ro/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 transcribe_sk/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 translate_sk/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+transcribe_sl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

transcribe_sl/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b43f71ca61d526d339dcee4c160fa8870a4e83741eb94aa9552c6a7e608d9f4d
+size 274477056