Drop support for old test-driver

nix/lib.nix

@@ -313,28 +313,7 @@ in
           ]};
         '';
 
-      test-driver =
-        let
-          upstream = hostPkgs.callPackage "${nixpkgs}/nixos/lib/test-driver" { };
-        in
-        upstream.overrideAttrs (_: {
-          # Try to apply the patch for backwards compat.
-          # It is included upstream starting from NixOS 23.05.
-          # github.com/NixOS/nixpkgs#228220
-          postPatch =
-            let
-              patch = "${lib.getBin hostPkgs.patch}/bin/patch";
-              patchFile = ../test/0001-nixos-test-driver-include-a-timeout-for-the-recv-cal.patch;
-            in
-            ''
-              echo "Try to apply patch ${patchFile}..."
-              if grep --quiet --fixed-strings "bash" test_driver/machine.py; then
-                echo "Patch already present, ignoring..."
-              else
-                ${patch} -p1 < ${patchFile}
-              fi
-            '';
-        });
+      test-driver = hostPkgs.callPackage "${nixpkgs}/nixos/lib/test-driver" { };
 
       runTest = { nodes, vlans, testScript, extraDriverArgs }: ''
         ${lib.getBin test-driver}/bin/nixos-test-driver \