flake.lock: Update

Flake lock file updates:

• Updated input 'deadnix':
    'github:astro/deadnix/d8e8ab9c55e3934b396ab485252c2dbdd8725729' (2022-12-16)
  → 'github:astro/deadnix/1159d6f365254c2bb6475d72df92623e5f88cc8e' (2023-02-28)
• Updated input 'fenix':
    'github:nix-community/fenix/d6f9bdfb4a25395b15f6c6feba3d0bba5e62b3ce' (2022-12-31)
  → 'github:nix-community/fenix/1c9e4995fc7022258817f9c9b02c7c4b3d09ca65' (2023-03-11)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/0d76b94c90a20c20d3e57ea1ab03d9afa00dee72' (2022-12-30)
  → 'github:rust-lang/rust-analyzer/9fca0a4afefead3daf8f66fd357999d7cd520880' (2023-03-10)
• Updated input 'sops-nix':
    'github:Mic92/sops-nix/855b8d51fc3991bd817978f0f093aa6ae0fae738' (2022-12-25)
  → 'github:Mic92/sops-nix/1568702de0d2488c1e77011a9044de7fadec80c4' (2023-03-10)
• Updated input 'sops-nix/nixpkgs-stable':
    'github:NixOS/nixpkgs/939c05a176b8485971463c18c44f48e56a7801c9' (2022-12-24)
  → 'github:NixOS/nixpkgs/d51554151a91cd4543a7620843cc378e3cbc767e' (2023-03-04)