Update duckdb index files

.gitattributes

@@ -54,3 +54,4 @@ bg-pl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bg-pt/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bg-ro/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bg-sk/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+bg-sl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

bg-sl/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:97a1a2f2023a5881ca71620464e93c3a1ac7279dad4d0e685880d2f694d8da8e
+size 80490496