Upgrade rust/crates/regex to 1.4.2

Test: make
Change-Id: I29c3d9dd49dfbaac10af4048c1bdfabf4518bff4
diff --git a/tests/test_default.rs b/tests/test_default.rs
index c0979c1..241e580 100644
--- a/tests/test_default.rs
+++ b/tests/test_default.rs
@@ -49,6 +49,7 @@
 mod multiline;
 mod noparse;
 mod regression;
+mod regression_fuzz;
 mod replace;
 mod searcher;
 mod set;