Include stalwart's patch for redirect to sender instead of our own

flake-module.nix

@@ -88,7 +88,7 @@
                             ./patches/sieve-rs.patch
                           ];
                           # Replace the string with `lib.fakeHash` after version changes in order to get the new hash value.
-                          cargoHash = "sha256-gb2oFlVA/vE6DoWWW8SCFA3l7rtV2RuosPUY+6IcKNM=";
+                          cargoHash = "sha256-0U0Z13a2vRxMFnaaHeXBjvYDjKStgqmuDboUVssVMQw=";
                         }
                       );
                   };