Upgrade rust/crates/regex to 1.4.1

Test: make
Change-Id: Ie12506e8c765f9dd8043cd61b0c77bebd887302e
diff --git a/Android.bp b/Android.bp
index d122541..f2e1727 100644
--- a/Android.bp
+++ b/Android.bp
@@ -34,8 +34,8 @@
 }
 
 // dependent_library ["feature_list"]
-//   aho-corasick-0.7.13 "default,std"
+//   aho-corasick-0.7.14 "default,std"
 //   lazy_static-1.4.0
 //   memchr-2.3.3 "default,std,use_std"
-//   regex-syntax-0.6.18 "default,unicode,unicode-age,unicode-bool,unicode-case,unicode-gencat,unicode-perl,unicode-script,unicode-segment"
+//   regex-syntax-0.6.20 "default,unicode,unicode-age,unicode-bool,unicode-case,unicode-gencat,unicode-perl,unicode-script,unicode-segment"
 //   thread_local-1.0.1