revert Reth support to v1.8.4

Version 1.9.0 is broken:

    https://github.com/paradigmxyz/reth/issues/19566

Note that v1.9.1, providing the fix for v1.9.0, also has issues:

    https://github.com/paradigmxyz/reth/releases/tag/v1.9.1

mmgen/data/version

@@ -1 +1 @@
-16.1.dev11
+16.1.dev12

mmgen/proto/eth/daemon.py

@@ -130,7 +130,7 @@ class geth_daemon(ethereum_daemon):
 		)
 
 class reth_daemon(geth_daemon):
-	daemon_data = _dd('Reth', 1009000, '1.9.0')
+	daemon_data = _dd('Reth', 1008004, '1.8.4')
 	version_pat = r'reth/v(\d+)\.(\d+)\.(\d+)'
 	exec_fn = 'reth'
 	version_info_arg = '--version'

nix/reth.nix

@@ -17,7 +17,7 @@ in
 
 pkgs.rustPlatform.buildRustPackage rec {
     pname = "reth";
-    version = "1.9.0";
+    version = "1.8.4";
 
     src = fetchGit {
         url = "https://github.com/paradigmxyz/reth";
@@ -26,7 +26,7 @@ pkgs.rustPlatform.buildRustPackage rec {
         shallow = true;
     };
 
-    cargoHash = "sha256-VOxT6+LCbWSNzSrLpD0DpbV0iPcy9nUtEaUgmQfTRsI=";
+    cargoHash = "sha256-nfk7xq5Mh4ggUHnkKc7cxmHT75IP+8yG6ssurTFURNw=";
 
     nativeBuildInputs = [
         pkgs.clang