prometheus-snmp-exporter: 0.29.0 -> 0.30.1

Add noop config to make snmp-exporter actually start without error as it
now requires at least some modules configured.

Signed-off-by: Sergei Lukianov <me@slukjanov.name>

nixos/tests/prometheus-exporters.nix

@@ -1733,6 +1733,7 @@ let
               community = "public";
               version = 2;
             };
+            modules.test = { };
           };
         };
         exporterTest = ''

pkgs/servers/monitoring/prometheus/snmp-exporter.nix

@@ -8,16 +8,16 @@
 
 buildGoModule rec {
   pname = "snmp_exporter";
-  version = "0.29.0";
+  version = "0.30.1";
 
   src = fetchFromGitHub {
     owner = "prometheus";
     repo = "snmp_exporter";
     rev = "v${version}";
-    sha256 = "sha256-eM3R4wNsBeGscaTzqdrj9ceiKFjRF3F78SWDamNMEYM=";
+    sha256 = "sha256-vLgqcqjnUvXYlxVyybDvra9YY5Im17L4I3LLf77tR8M=";
   };
 
-  vendorHash = "sha256-C5iY3hBqepxLkGwPDVmnDf/ugF4h5y8scEomU9mkMEM=";
+  vendorHash = "sha256-3Rjt91Xb0Y5OCkwGQVQLZ6zK0+xVk8XNrGfax6zZJ7o=";
 
   buildInputs = [ net-snmp ];