Update duckdb index files

.gitattributes

@@ -356,3 +356,4 @@ uzbek/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 uzbek/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 vietnamese/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 vietnamese/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+welsh/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

welsh/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7a7dacdc3d8512971391b1e739a690dff8773c58db42d747d87fd4cea8bd450d
+size 9711616