Upgrade rust/crates/async-trait to 0.1.48

Test: make
Change-Id: I898f35cd086b1bd9952eba11d5d59d31f78a5d16
diff --git a/METADATA b/METADATA
index 8d7bc4f..3e6f11b 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/async-trait/async-trait-0.1.42.crate"
+    value: "https://static.crates.io/crates/async-trait/async-trait-0.1.48.crate"
   }
-  version: "0.1.42"
+  version: "0.1.48"
   license_type: NOTICE
   last_upgrade_date {
-    year: 2020
-    month: 11
-    day: 24
+    year: 2021
+    month: 4
+    day: 1
   }
 }