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/9a025daf6799e3af80b677f0af57ef76432c3fcf?narHash=sha256-ih8NPk3Jn5EAILOGQZ%2BKS5NLmu6QmwohJX%2B36MaTAQE%3D' (2024-06-01)
• 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/d6d735e6f20ef78b16a79886fe28bd69cf059504?narHash=sha256-qBruki5NHrSqIw5ulxtwFmVsb6W/aOKOMjsCJjfalA4%3D' (2024-05-31)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/d8fe5e6c92d0d190646fb9f1056741a229980089?narHash=sha256-iMUFArF0WCatKK6RzfUJknjem0H9m4KgorO/p3Dopkk%3D' (2024-03-29)
  → 'github:nixos/nixpkgs/ad57eef4ef0659193044870c731987a6df5cf56b?narHash=sha256-SzDKxseEcHR5KzPXLwsemyTR/kaM9whxeiJohbL04rs%3D' (2024-05-29)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/2e7ccf572ce0f0547d4cf4426de4482936882d0e?narHash=sha256-ms3aD3Z2jKd1dk8qd0D/N7C8vFxn6z6LQ1G7cvNTVJ8%3D' (2024-05-29)
  → 'github:oxalica/rust-overlay/ab69b67fac9a96709fbef0b899db308ca714a120?narHash=sha256-4gVhbC%2BNjSQ4c6cJvJGNCI1oTcD%2B8jRRNAnOF9faGCE%3D' (2024-06-01)