flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/cd18e2ae9ab8e2a0a8d715b60c91b54c0ac35ff9?narHash=sha256-c83Y9t815Wa34khrux81j8K8ET94ESmCuwORSKm2bQY%3D' (2024-06-08)
  → 'github:NixOS/nixpkgs/4284c2b73c8bce4b46a6adf23e16d9e2ec8da4bb?narHash=sha256-i4vJL12/AdyuQuviMMd1Hk2tsGt02hDNhA0Zj1m16N8%3D' (2024-07-05)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/1f536afad5c18ea4ae6bb592c3fef038e1e33568?narHash=sha256-9Z95F8lnY/5sOf7Z4IdABKz1ulB0ueNrZU864rQj280%3D' (2024-06-09)
  → 'github:oxalica/rust-overlay/3eed08a074cd2000884a69d448d70da2843f7103?narHash=sha256-w3CCVK9LJ5aznXGkO1IyAlbvMNJfyA%2BdBF7Z1Zwx1LA%3D' (2024-07-07)
• Removed input 'rust-overlay/flake-utils'
• Removed input 'rust-overlay/flake-utils/systems'
• Updated input 'rust-overlay/nixpkgs':
    'github:NixOS/nixpkgs/90f456026d284c22b3e3497be980b2e47d0b28ac?narHash=sha256-LE8lVX28MV2jWJsidW13D2qrHU/RUUONendL2Q/WlJg%3D' (2024-01-29)
  → 'github:NixOS/nixpkgs/e6cea36f83499eb4e9cd184c8a8e823296b50ad5?narHash=sha256-WdWDpNaq6u1IPtxtYHHWpl5BmabtpmLnMAx0RdJ/vo8%3D' (2024-06-15)