Update duckdb index files

.gitattributes

@@ -37,3 +37,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.wav filter=lfs diff=lfs merge=lfs -text
 default/abstracts/index.duckdb filter=lfs diff=lfs merge=lfs -text
 abstracts[[:space:]](2021)/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+abstracts[[:space:]](2023)/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

abstracts (2023)/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9968458644720a4b7676dbfafe4a0b4e0cbfb2567deeb4d8a2e95415867c1695
+size 5466763264