chore(test): Update flake.lock

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/aa247c0c90ecf4ae7a032c54fdc21b91ca274062?narHash=sha256-GaliJqfFwyYxReFywxAa8orCO%2BEnDq2NK2F%2B5aSc8vo%3D' (2024-07-14)
  → 'github:nixos/nixpkgs/6e14bbce7bea6c4efd7adfa88a40dac750d80100?narHash=sha256-pFSxgSZqZ3h%2B5Du0KvEL1ccDZBwu4zvOil1zzrPNb3c%3D' (2024-07-20)
• Updated input 'services-flake':
    'github:juspay/services-flake/cb68906aba2bc0198565be6709ba700178099226?narHash=sha256-7pol6f67i9llosHaiZlnEpHH27ZKcLgVnr4Se6p7w4Q%3D' (2024-07-15)
  → 'github:juspay/services-flake/9a5e1e65c13ab7be48fa67a273e9fd009f111d14?narHash=sha256-LFYE2Ez6Wfj4WYgZR7p%2BUMzqJveeGLqUTDD%2B/bTQvlI%3D' (2024-07-21)