Update duckdb index files

.gitattributes

@@ -127,3 +127,4 @@ middle_school_mathematics/val/index.duckdb filter=lfs diff=lfs merge=lfs -text
 middle_school_politics/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 middle_school_politics/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 middle_school_politics/val/index.duckdb filter=lfs diff=lfs merge=lfs -text
+operating_system/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text

operating_system/dev/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:30c032a5905c9d097f0ea4e9782eac47c546a27ceb1b4e656959b44356bf2409
+size 1060864