Update duckdb index files

.gitattributes

@@ -79,3 +79,4 @@ OpenSubtitles/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 PubMed[[:space:]]Abstracts/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 StackExchange/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 UPSTO[[:space:]]Backgrounds/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+Ubuntu[[:space:]]IRC/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text

Ubuntu IRC/partial-test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:85b8d20b9c8cdeb32560c43549eea0f19e7fca0a031a842b76d0ef061772276b
+size 237776896