Upgrade rust/crates/itoa to 0.4.7

Test: make
Change-Id: Ib3013150034cd7ce81438adff0aa9a5f738ae041
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 82a1934..0192401 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,11 +1,11 @@
 [package]
 name = "itoa"
-version = "0.4.6" # remember to update html_root_url
+version = "0.4.7" # remember to update html_root_url
 authors = ["David Tolnay <dtolnay@gmail.com>"]
 license = "MIT OR Apache-2.0"
 description = "Fast functions for printing integer primitives to an io::Write"
 repository = "https://github.com/dtolnay/itoa"
-documentation = "https://github.com/dtolnay/itoa"
+documentation = "https://docs.rs/itoa"
 categories = ["value-formatting"]
 readme = "README.md"
 exclude = ["performance.png"]