Upgrade rust/crates/itoa to 0.4.8

Test: make
Change-Id: Ib96e77c0e5ac556c072449e47db7527e652cd3a1
diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index 14919dc..8da2e20 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,5 +1,5 @@
 {
   "git": {
-    "sha1": "08c79b5e2348a4b44cac8860612c9ee1f5518544"
+    "sha1": "de247d6ac25d2e62d4cbd195f064ed4af35fd4eb"
   }
 }