Update duckdb index files

.gitattributes

@@ -37,3 +37,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.ogg filter=lfs diff=lfs merge=lfs -text
 *.wav filter=lfs diff=lfs merge=lfs -text
 Reproducibility--naacl22_wikitext15M/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+Reproducibility--naacl22_wikitext15M/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

Reproducibility--naacl22_wikitext15M/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5da4fd5ed4f1319bacb24946833a3e94bbb52c35df0b6235f7580e469409c469
+size 2633728