nmigen: bump

eda/nmigen.nix

@@ -6,8 +6,8 @@ python3Packages.buildPythonPackage {
   src = fetchFromGitHub {
     owner = "m-labs";
     repo = "nmigen";
-    rev = "744e33f42df53b2bba75a808226221cc99b35de0";
-    sha256 = "1qsbw5s9mmc6ddk5iy3mpif6rq644jvqw95v8xa3ph86hqdj2x6v";
+    rev = "c337246fc581ccac0273f5661f65815266144862";
+    sha256 = "03gbd5k87w9ifa8iz0wprpswv7qn93swzcvjnvs5czn39lwvwgh4";
   };
 
   checkPhase = "PATH=${yosys}/bin:${symbiyosys}/bin:${yices}/bin:$PATH python -m unittest discover nmigen.test -v";