Upgrade rust/crates/regex to 1.4.3

Test: make
Change-Id: I0a2f64e0e7e81dc3e46c5c21ffa0bfbc7b1fb28f
diff --git a/examples/shootout-regex-dna-single-cheat.rs b/examples/shootout-regex-dna-single-cheat.rs
index ec444b4..04ed05a 100644
--- a/examples/shootout-regex-dna-single-cheat.rs
+++ b/examples/shootout-regex-dna-single-cheat.rs
@@ -1,5 +1,5 @@
 // The Computer Language Benchmarks Game
-// http://benchmarksgame.alioth.debian.org/
+// https://benchmarksgame-team.pages.debian.net/benchmarksgame/
 //
 // contributed by the Rust Project Developers
 // contributed by TeXitoi