Update duckdb index files

.gitattributes

@@ -23,3 +23,4 @@ default/numerical_reasoning/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/spelling_error/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/word_overlap/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/antonym/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/length_mismatch/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/length_mismatch/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:21acc1833a4ee9413ddc9c7d736574ac2f423286bc250c13ed3ef106ead3f33b
+size 4468736