Rust: use 1.51.0 prebuilts

Test: TH
Change-Id: I11c10eda1e989db5084556ff248ff0d0fa85b98c
diff --git a/rust/config/global.go b/rust/config/global.go
index 9208ddb..18776ab 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 = "1.50.0"
+	RustDefaultVersion = "1.51.0"
 	RustDefaultBase    = "prebuilts/rust/"
 	DefaultEdition     = "2018"
 	Stdlibs            = []string{