Update duckdb index files

.gitattributes

@@ -194,3 +194,4 @@ teacher_qualification/val/index.duckdb filter=lfs diff=lfs merge=lfs -text
 middle_school_physics/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 marxism/val/index.duckdb filter=lfs diff=lfs merge=lfs -text
 modern_chinese_history/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
+mao_zedong_thought/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

mao_zedong_thought/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:464a93c252fae161eb46db5d6ec55f0bbd62ccd222e569a962758a10bd0d9eed
+size 1060864