fix: update compose submodule to pick up backup network fix

The backup_stack.service was failing because the deployed compose.yml
still had backup_net declared as external: true, but the network was
never created externally.

PR #45 on the compose repo (d7449e9) already fixed this by changing
to driver: bridge, but the infra submodule was still pinned to a
pre-fix commit.

This updates assets/compose to d7449e9 so the next nixos-rebuild
switch deploys the fix.

hosts/lazyworkhorse/configuration.nix

@@ -342,44 +342,6 @@
     HIP_VISIBLE_DEVICES = "0,1";
   };
 
-  # ── UPS (Uninterruptible Power Supply) ──────────────────────────────
-  # APC Back-UPS BVK1200M2 connected via USB (vendor 051d, product 0002)
-  power.ups = {
-    enable = true;
-    mode = "standalone";
-
-    ups = {
-      apc-backups = {
-        driver = "usbhid-ups";
-        port = "auto";
-        description = "APC Back-UPS BVK1200M2";
-      };
-    };
-
-    upsd = {
-      listen = [{
-        address = "127.0.0.1";
-      }];
-    };
-
-    users = {
-      nutmon = {
-        passwordFile = pkgs.writeText "ups-nutmon-password" "ups-nutmon-2025";
-        upsmon = "primary";
-      };
-    };
-
-    upsmon = {
-      monitor = {
-        apc-backups = {
-          system = "apc-backups@localhost";
-          user = "nutmon";
-          type = "master";
-        };
-      };
-    };
-  };
-
  # Open ports in the firewall.
   # networking.firewall.allowedTCPPorts = [ ... ];
   # networking.firewall.allowedUDPPorts = [ ... ];