Update the Rust prebuilt version number

This CL changes the Rust prebuilt version number from 1.51.0 to 1.52.1.

Test: TH
Change-Id: I02bf6166323040621dcbfe9c823bb1982a2e9a36
diff --git a/rust/config/global.go b/rust/config/global.go
index 1b56237..39ed992 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 = "1.51.0"
+	RustDefaultVersion = "1.52.1"
 	RustDefaultBase    = "prebuilts/rust/"
 	DefaultEdition     = "2018"
 	Stdlibs            = []string{