Update xz to 1.9.

This makes decompression more than 10% faster.

Closes #13778.

Signed-off-by: Philipp Wollermann <philwo@google.com>

third_party/BUILD

diff --git a/third_party/BUILD b/third_party/BUILD
index b346b14..7dc02fa 100644
--- a/third_party/BUILD
+++ b/third_party/BUILD
@@ -701,7 +701,7 @@
 distrib_java_import(
     name = "xz",
     enable_distributions = ["debian"],
-    jars = ["xz/xz-1.5.jar"],
+    jars = ["xz/xz-1.9.jar"],
 )
 
 # To be used by the skylark example.