flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/db7af3238117cb215b7096bd4cf1e9970e9a405b?narHash=sha256-jZr%2B8ZwMLlNab3qwfhsuAZyT9DfQ3d%2B18Sg9wXWXPIU%3D' (2024-09-30)
  → 'github:nix-community/fenix/a9d2e5fa8d77af05240230c9569bbbddd28ccfaf?narHash=sha256-tvN9v5gTxLI5zOKsNvYl1aUxIitHm8Nj3vKdXNfJo50%3D' (2024-10-01)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/822644d97d7f64e1bdff25b1d636e366a29facc4?narHash=sha256-iJTCG7vtECll27sxDElL4SuIY/kRhamJf0DDYCW6fb4%3D' (2024-09-29)
  → 'github:rust-lang/rust-analyzer/28830ff2f1158ee92f4852ef3ec35af0935d1562?narHash=sha256-xxgUHwwJ%2B1xQQoUWvLDo807IZ0MDldkfr9N1G4fvNJU%3D' (2024-09-30)
• Updated input 'nix':
    'github:NixOS/nix/14f029dbe807b3f309340d4ca7eac7de1b108d57?narHash=sha256-eNGIprxmPhdxnDit7zvdRFZ7D8/2o/UZ/yJrrfCG3Nc%3D' (2024-09-30)
  → 'github:NixOS/nix/96ba7f9d77d6f2fd8fd64aafc50dd8c850e8a902?narHash=sha256-Q8MX1w70gctLAFrPNgxcdni5iUzWYW9qhOpiIU76ZhA%3D' (2024-10-01)