Upgrade rust/crates/regex-syntax to 0.6.22

Test: make
Change-Id: I4979a9897fa2edeb552d795b067abcdd6036de0a
diff --git a/TEST_MAPPING b/TEST_MAPPING
index fff6ba4..03d7e78 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,16 +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": "regex-syntax_host_test_src_lib"
-    },
-    {
-      "host": true,
-      "name": "libsqlite3-sys_host_test_src_lib"
-    },
-    {
       "name": "libsqlite3-sys_device_test_src_lib"
+    },
+    {
+      "name": "keystore2_test"
     }
   ]
 }