lfs: track jxl

Signed-off-by: Balazs Horvath <acsipont@gmail.com>

.gitattributes

@@ -56,3 +56,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 # Video files - compressed
 *.mp4 filter=lfs diff=lfs merge=lfs -text
 *.webm filter=lfs diff=lfs merge=lfs -text
+*.jxl filter=lfs diff=lfs merge=lfs -text