Update duckdb index files

.gitattributes

@@ -192,3 +192,4 @@ teacher_qualification/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 fire_engineer/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 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

marxism/val/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c48415dd700323b1bc407c0bc0947963c82d44abd5a6181ba55f89950613addd
+size 1060864