vms/run: make portmap a dict to fix serializer

pkgs/clan-cli/clan_cli/vms/qemu.py

@@ -92,11 +92,11 @@ def qemu_command(
     virtiofsd_socket: Path,
     qmp_socket_file: Path,
     qga_socket_file: Path,
-    portmap: list[tuple[int, int]] | None = None,
+    portmap: dict[int, int] | None = None,
     interactive: bool = False,
 ) -> QemuCommand:
     if portmap is None:
-        portmap = []
+        portmap = {}
     kernel_cmdline = [
         (Path(nixos_config["toplevel"]) / "kernel-params").read_text(),
         f'init={nixos_config["toplevel"]}/init',
@@ -105,7 +105,7 @@ def qemu_command(
     ]
     if not vm.waypipe:
         kernel_cmdline.append("console=tty0")
-    hostfwd = ",".join(f"hostfwd=tcp::{h}-:{g}" for h, g in portmap)
+    hostfwd = ",".join(f"hostfwd=tcp::{h}-:{g}" for h, g in portmap.items())
     # fmt: off
     command = [
         "qemu-kvm",