chore(example/share-services/northwind): Update flake.lock

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/01f064c99c792715054dc7a70e4c1626dbbec0c3?narHash=sha256-3//V84fYaGVncFImitM6lSAliRdrGayZLdxWlpcuGk0%3D' (2024-09-13)
  → 'github:nixos/nixpkgs/a1d92660c6b3b7c26fb883500a80ea9d33321be2?narHash=sha256-V5LpfdHyQkUF7RfOaDPrZDP%2Boqz88lTJrMT1%2BstXNwo%3D' (2024-09-20)
• Updated input 'services-flake':
    'github:juspay/services-flake/37176c49c20a01999abdf256c9e71bf69a372329?narHash=sha256-3NxsWGgCp6x8ZI8Pskw3bwKkCB5lKbdVnY5nhfiVbZw%3D' (2024-09-08)
  → 'github:juspay/services-flake/5960a2c553ba6f5efec8d6aad64219c8fa036e50?narHash=sha256-XTPhu4CKydPlJJJIAH7XtWDRTvEAV5podwWenI9OvGY%3D' (2024-09-18)