Update duckdb index files

.gitattributes

@@ -460,3 +460,4 @@ default/lv.test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/lv.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/mdf.test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/mdf.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/lt.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/lt.validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ad6903befaef8f9ff8b016f3a3ce806275e26ac27251f42268fd4a505c4e13e2
+size 3158016