Fix case-insensitive lookup of package Depends :/.

diff --git a/apt b/apt
index c65bdf3bf1390cee509fd850e006c0faebf252ab..9fa247dc9ba2aa28ae564e96cba5b2b23bcac91b 160000 (submodule)
--- a/apt
+++ b/apt
@@ -1 +1 @@
-Subproject commit c65bdf3bf1390cee509fd850e006c0faebf252ab
+Subproject commit 9fa247dc9ba2aa28ae564e96cba5b2b23bcac91b