Update duckdb index files

.gitattributes

@@ -176,3 +176,4 @@ legal_professional/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 legal_professional/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 high_school_biology/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 middle_school_biology/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+middle_school_biology/val/index.duckdb filter=lfs diff=lfs merge=lfs -text

middle_school_biology/val/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b64407820aa99c933d48d59b0bf195f748f3333a8c47c17c66a09c99770e0d91
+size 1060864