Update duckdb index files

.gitattributes

@@ -10,3 +10,4 @@ tripadvisor/qg_subjqa-train.parquet filter=lfs diff=lfs merge=lfs -text
 tripadvisor/qg_subjqa-test.parquet filter=lfs diff=lfs merge=lfs -text
 all/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 all/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+all/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

all/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5f5ad1c13ae348b222e6d9d4a374ec851dda7607264b35816bd57cf2961e4da1
+size 9449472