Upgrade rust/crates/regex-syntax to 0.6.22

Test: make
Change-Id: I4979a9897fa2edeb552d795b067abcdd6036de0a
diff --git a/METADATA b/METADATA
index dda6e41..1c7218b 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/regex-syntax/regex-syntax-0.6.21.crate"
+    value: "https://static.crates.io/crates/regex-syntax/regex-syntax-0.6.22.crate"
   }
-  version: "0.6.21"
+  version: "0.6.22"
   license_type: NOTICE
   last_upgrade_date {
-    year: 2020
-    month: 11
-    day: 2
+    year: 2021
+    month: 1
+    day: 8
   }
 }