Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ default/lexicon_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/lexicon_train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/lexicon_valid/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/sentence_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/sentence_valid/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/sentence_valid/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:39f2fda1d977153acc304e3e056ad5cbfe78f37ce54bc6c540cc1b40bc91ef37
+size 1847296