Update duckdb index files

.gitattributes

@@ -73,3 +73,4 @@ DM[[:space:]]Mathematics/partial-train/index.duckdb filter=lfs diff=lfs merge=lf
 EuroParl/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 FreeLaw/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Github/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+Gutenberg[[:space:]](PG-19)/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text

Gutenberg (PG-19)/partial-test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:58050f0d11527396c9c3328e16a544f3cfbce219a63c639e8e064f63e7e8df62
+size 771502080