Update duckdb index files

.gitattributes

@@ -91,3 +91,4 @@ mbpp-js-keep/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 mbpp-lua/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 mbpp-lua-keep/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 mbpp-php/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+mbpp-php-keep/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

mbpp-php-keep/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a2d065b060baed2faaf51e62cc39e78259dabf1b6d526af2cfee594eb123516c
+size 1323008