Update rustc to 1.44.0

Test: Treehugger
Change-Id: Ib940bc5afbbbec6b16ed7c2879ad31438e58907d
diff --git a/rust/config/global.go b/rust/config/global.go
index 63624c0..663514d 100644
--- a/rust/config/global.go
+++ b/rust/config/global.go
@@ -24,7 +24,7 @@
 var pctx = android.NewPackageContext("android/soong/rust/config")
 
 var (
-	RustDefaultVersion = "1.43.0"
+	RustDefaultVersion = "1.44.0"
 	RustDefaultBase    = "prebuilts/rust/"
 	DefaultEdition     = "2018"
 	Stdlibs            = []string{