Update duckdb index files

.gitattributes

@@ -1014,3 +1014,4 @@ az/partial-validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 az/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bn/partial-validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ca/partial-validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cy/partial-validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

cy/partial-validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:109f3a68dfbc251dead588f68e664e5f1c103687814b19b5972677ba33bf63ee
+size 19410944