flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/aaeaf4574767a0f5ed1787e990139aefcf4db103?narHash=sha256-iGb6ptUaNBOCftKnNJiWT5z1ftngfNtwqJkD8Z9Vwfw%3D' (2024-03-30)
  → 'github:nix-community/fenix/ab655c627777ab5f9964652fe23bbb1dfbd687a8?narHash=sha256-ixopuTeTouxqTxfMuzs6IaRttbT8JqRW5C9Q/57WxQw%3D' (2024-06-08)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/f5a9250147f6569d8d89334dc9cca79c0322729f?narHash=sha256-dyezzeSbWMpflma%2BE9USmvSxuLgGcNGcGw3cOnX36ko%3D' (2024-03-29)
  → 'github:rust-lang/rust-analyzer/48bbdd6a74f3176987d5c809894ac33957000d19?narHash=sha256-%2BlRAmz92CNUxorqWusgJbL9VE1eKCnQQojglRemzwkw%3D' (2024-06-05)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/d8fe5e6c92d0d190646fb9f1056741a229980089?narHash=sha256-iMUFArF0WCatKK6RzfUJknjem0H9m4KgorO/p3Dopkk%3D' (2024-03-29)
  → 'github:nixos/nixpkgs/051f920625ab5aabe37c920346e3e69d7d34400e?narHash=sha256-4q0s6m0GUcN7q%2BY2DqD27iLvbcd1G50T2lv08kKxkSI%3D' (2024-06-07)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/2e7ccf572ce0f0547d4cf4426de4482936882d0e?narHash=sha256-ms3aD3Z2jKd1dk8qd0D/N7C8vFxn6z6LQ1G7cvNTVJ8%3D' (2024-05-29)
  → 'github:oxalica/rust-overlay/6dc3e45fe4aee36efeed24d64fc68b1f989d5465?narHash=sha256-wqbRwq3i7g5EHIui0bIi84mdqZ/It1AXBSLJ5tafD28%3D' (2024-06-08)