Update duckdb index files

.gitattributes

@@ -93,3 +93,4 @@ econometrics/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 econometrics/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 econometrics/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 electrical_engineering/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
+electrical_engineering/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

electrical_engineering/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:11a2616e0c9b80c3f9a359a51cfa73da9df4741c34e17ff8f1a6a0f2ee3aede6
+size 1060864