Upgrade rust/crates/itoa to 0.4.8

Test: make
Change-Id: Ib96e77c0e5ac556c072449e47db7527e652cd3a1
diff --git a/METADATA b/METADATA
index 8ced762..e9cdb68 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/itoa/itoa-0.4.7.crate"
+    value: "https://static.crates.io/crates/itoa/itoa-0.4.8.crate"
   }
-  version: "0.4.7"
+  version: "0.4.8"
   license_type: NOTICE
   last_upgrade_date {
-    year: 2020
-    month: 12
-    day: 29
+    year: 2021
+    month: 9
+    day: 22
   }
 }