Upgrade rust/crates/regex to 1.4.5

Test: make
Change-Id: I1d9343bd9712ddd57023af2c5d248993a2c31088
diff --git a/src/re_set.rs b/src/re_set.rs
index 0a00229..5cb47ad 100644
--- a/src/re_set.rs
+++ b/src/re_set.rs
@@ -43,7 +43,7 @@
 /// Note that it would be possible to adapt the above example to using `Regex`
 /// with an expression like:
 ///
-/// ```ignore
+/// ```text
 /// (?P<email>[a-z]+@(?P<email_domain>[a-z]+[.](com|org|net)))|(?P<domain>[a-z]+[.](com|org|net))
 /// ```
 ///