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/bedf55efd03d4796a3ddb267d7e081cc6b34483d?narHash=sha256-%2Bx7sc7OPYwi8OPebZ4Pqtzo9XyRcG5Sx7UZSGdj7HVs%3D' (2024-06-22)
• 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/c4681ea2cc1f2d1e1a0568ad03069c57bdcd7a88?narHash=sha256-Roaz1CckctannQVyhfwJ7sqmCGmU3hfTo/7Nmms06WM%3D' (2024-06-21)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/d8fe5e6c92d0d190646fb9f1056741a229980089?narHash=sha256-iMUFArF0WCatKK6RzfUJknjem0H9m4KgorO/p3Dopkk%3D' (2024-03-29)
  → 'github:nixos/nixpkgs/d603719ec6e294f034936c0d0dc06f689d91b6c3?narHash=sha256-k3JqJrkdoYwE3fHE6xGDY676AYmyh4U2Zw%2B0Bwe5DLU%3D' (2024-06-20)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/2e7ccf572ce0f0547d4cf4426de4482936882d0e?narHash=sha256-ms3aD3Z2jKd1dk8qd0D/N7C8vFxn6z6LQ1G7cvNTVJ8%3D' (2024-05-29)
  → 'github:oxalica/rust-overlay/ff019b65a656d36dca3e57b43c40c44eec7852c5?narHash=sha256-ZDS8x9XpFeSBs9gMTHoujKWPn%2Bi9ecqE9NWEUF07Yuc%3D' (2024-06-22)
• 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)