flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'https://api.flakehub.com/f/pinned/nix-community/fenix/0.1.1618%2Brev-9ccae1754eec0341b640d5705302ac0923d22875/018aea4c-03c9-7734-95d5-b84cc8881e3d/source.tar.gz?narHash=sha256-0dZpggYjjmWEk%2BrGixiBHOHuQfLzEzNfrtjSig04s6Q%3D' (2023-10-01)
  → 'https://api.flakehub.com/f/pinned/nix-community/fenix/0.1.1822%2Brev-209048d7c545905c470f6f8c05c5061f391031a8/018e98ba-d842-7dad-9d6a-0d0ee173b6b1/source.tar.gz?narHash=sha256-WJvDdOph001fA1Ap3AyaQtz/afJAe7meSG5uJAdSE%2BA%3D' (2024-04-01)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/4e29820f6d9880606a403e7bec6e91312e7f0575' (2023-02-26)
  → 'github:rust-lang/rust-analyzer/e4a405f877efd820bef9c0e77a02494e47c17512' (2024-03-31)
• Updated input 'naersk':
    'github:nix-community/naersk/d998160d6a076cfe8f9741e56aeec7e267e3e114' (2022-12-15)
  → 'github:nix-community/naersk/aeb58d5e8faead8980a807c840232697982d47b9' (2023-10-27)
• Updated input 'nix':
    'https://api.flakehub.com/f/pinned/NixOS/nix/2.18.1/018af406-b173-7112-9c1c-82f5b645e9d3/source.tar.gz?narHash=sha256-WNmifcTsN9aG1ONkv%2Bl2BC4sHZZxtNKy0keqBHXXQ7w%3D' (2023-10-02)
  → 'https://api.flakehub.com/f/pinned/NixOS/nix/2.21.2/018eaedc-df49-7da8-8007-06186938ee08/source.tar.gz?narHash=sha256-ObaVDDPtnOeIE0t7m4OVk5G%2BOS6d9qYh%2BktK67Fe/zE%3D' (2024-04-03)
• Updated input 'nix/flake-compat':
    'github:edolstra/flake-compat/0f9255e01c2351cc7d116c072cb317785dd33b33' (2023-10-04)
  → 'github:edolstra/flake-compat/35bb57c0c8d8b62bbfd284272c928ceb64ddbde9' (2023-01-17)
• Added input 'nix/libgit2':
    'github:libgit2/libgit2/45fd9ed7ae1a9b74b957ef4f337bc3c8b3df01b5' (2023-10-18)
• Removed input 'nix/lowdown-src'
• Updated input 'nix/nixpkgs':
    'github:NixOS/nixpkgs/22723a1d7deab53e5c1022906089e4247a5d3e77' (2023-10-09)
  → 'github:NixOS/nixpkgs/b550fe4b4776908ac2a861124307045f8e717c8e' (2024-02-28)