Update duckdb index files

.gitattributes

@@ -49,3 +49,4 @@ covid19_emergency_event/validation/index.duckdb filter=lfs diff=lfs merge=lfs -t
 covid19_emergency_event/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 covid19_emergency_event/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 german_argument_mining/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+german_argument_mining/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

german_argument_mining/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a5919f5b6f689ad58bc446203d15dba9091d68a6bec7a43deac76661d47a8fef
+size 7090176