make tests green again

(cherry picked from commit fa982b43f0)

tests/errmsgs/tgcsafety.nim

@@ -6,7 +6,7 @@ type mismatch: got <AsyncHttpServer, Port, proc (req: Request): Future[system.vo
 but expected one of:
 proc serve(server: AsyncHttpServer; port: Port;
           callback: proc (request: Request): Future[void] {.closure, gcsafe.};
-          address = ""): Future[void]
+          address = ""): owned(Future[void])
   first type mismatch at position: 3
   required type: proc (request: Request): Future[system.void]{.closure, gcsafe.}
   but expression 'cb' is of type: proc (req: Request): Future[system.void]{.locks: <unknown>.}