liburing.spec: use brick.kernel.dk and add the signature
@@ -3,7 +3,8 @@ Version: 0.4
Release: 1%{?dist}
Summary: Linux-native io_uring I/O access library
License: LGPLv2+ / MIT
-Source: https://git.kernel.dk/cgit/liburing/snapshot/%{name}-%{version}.tar.gz
+Source0: https://brick.kernel.dk/snaps/%{name}-%{version}.tar.gz
+Source1: https://brick.kernel.dk/snaps/%{name}-%{version}.tar.gz.asc
URL: https://git.kernel.dk/cgit/liburing/
BuildRequires: gcc
