Update duckdb index files

.gitattributes

@@ -54,3 +54,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 microsoft--LCC_csharp/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+microsoft--LCC_csharp/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

microsoft--LCC_csharp/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:57ea402be62fb5540042157caff6121fe1edced5a6441112c63482289358a5ce
+size 109588480