chore(awgen): bump 0.3 -> 0.3.1

Upstream tagged v0.3.1; refresh src and cargo hashes (dependencies
changed between the two tags). Verified with nix build .#awgen and
result/bin/awgen --version.

packages/awgen/package.nix

@@ -6,17 +6,17 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "awgen";
-  version = "0.3";
+  version = "0.3.1";
 
   src = fetchFromGitea {
     domain = "git.millerson.name";
     owner = "alex";
     repo = "awgen";
     rev = "v${version}";
-    hash = "sha256-86YTRYXiCpGQ1PkbGhYIwBwTMcO7ffZDla9PNFtrhIE=";
+    hash = "sha256-yXkwUPqMCsukBp4hZfyhSxNyAvGGD7TFgSZUnMo+kr0=";
   };
 
-  cargoHash = "sha256-Y7SKh0F7wOTejBesjQbLVBoZKjDDrVGUjGCVZRlP4lg=";
+  cargoHash = "sha256-5ESwlVDX+coAYce5J19R3akCdQ/VqqV7CxFluTAlPvE=";
 
   passthru = {
     category = "Networking";