Upgrade rust/crates/regex to 1.4.3

Test: make
Change-Id: I0a2f64e0e7e81dc3e46c5c21ffa0bfbc7b1fb28f
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 7bc6ed2..03d7e78 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,12 +1,11 @@
-// Generated by cargo2android.py for tests in Android.bp
+// Generated by cargo2android.py for tests that depend on this crate.
 {
   "presubmit": [
     {
-      "host": true,
-      "name": "libsqlite3-sys_host_test_src_lib"
+      "name": "libsqlite3-sys_device_test_src_lib"
     },
     {
-      "name": "libsqlite3-sys_device_test_src_lib"
+      "name": "keystore2_test"
     }
   ]
 }