Merge "Upgrade rust/crates/regex to 1.3.9" am: dc4835a95b am: caad50e848 am: 002331d57e

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/regex/+/1320334

Change-Id: Ifa676f44d8e7e4ea19c3a5648a0bd6400d3cc7a6