Upgrade rust/crates/itoa to 0.4.7

Test: make
Change-Id: Ib3013150034cd7ce81438adff0aa9a5f738ae041
diff --git a/METADATA b/METADATA
index 602bef6..8ced762 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/itoa/itoa-0.4.6.crate"
+    value: "https://static.crates.io/crates/itoa/itoa-0.4.7.crate"
   }
-  version: "0.4.6"
+  version: "0.4.7"
   license_type: NOTICE
   last_upgrade_date {
     year: 2020
-    month: 8
-    day: 21
+    month: 12
+    day: 29
   }
 }