Update duckdb index files

.gitattributes

@@ -77,3 +77,4 @@ transcribe_pl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 translate_pl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 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

transcribe_sk/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c817e10de46887d72be726047f73f8a9176c2ef58eb58db1ee68b4f9de027a69
+size 277098496