Update duckdb index files

.gitattributes

@@ -249,3 +249,4 @@ azerbaijani/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bengali/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bengali/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bengali/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+burmese/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

burmese/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:885187b9436bd42f0ddb916208cca5b29726fa716034b7ef398a08e6d11b64a4
+size 17838080