Update duckdb index files

.gitattributes

@@ -66,3 +66,4 @@ default/FrenchPodcastsTrain/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/FrenchLibrispeechTextOnlyTrain/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/WmtEnFrTest/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/ProjectgutenbergFrTest/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/ProjectgutenbergFrTrain/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/ProjectgutenbergFrTrain/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7106e0ad36b55b35b6cec02f37919e51bfef72db2f68c4991b6155d0353582d0
+size 1577857024