Use 1.49.0 prebuilts

Bug: 176888219
Test: build external/rust/crates
Change-Id: I979720ac75e8546058c23ac86b2b64ac518b115c
diff --git a/rust/config/global.go b/rust/config/global.go
index 22d9567..52a50a9 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 = "1.48.0"
+	RustDefaultVersion = "1.49.0"
 	RustDefaultBase    = "prebuilts/rust/"
 	DefaultEdition     = "2018"
 	Stdlibs            = []string{