flake.lock: Update (#42)

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/94a5b9a4f8df7b2fa328044b8908b892a2733f60' (2023-09-09)
  → 'github:nix-community/fenix/95d6c30ecac01307772ec4273c649dab40211a9e' (2023-09-16)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/c405509f2e61cadaa8b18f340582e5c362356f2d' (2023-09-08)
  → 'github:rust-lang/rust-analyzer/12e28c35758051dd6bc9cdf419a50dff80fab64d' (2023-09-14)
• Updated input 'nickel':
    'github:tweag/nickel/e412993ad8413107a8a71078914937787665579a' (2023-09-11)
  → 'github:tweag/nickel/b2459d31722dcb4f4ea50452c8c5b25ca3560114' (2023-09-15)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/b200e0df08f80c32974a6108ce431d8a8a5e6547' (2023-09-07)
  → 'github:NixOS/nixpkgs/46688f8eb5cd6f1298d873d4d2b9cf245e09e88e' (2023-09-15)
• Updated input 'topiary':
    'github:tweag/topiary/fe6083d2b7c762f5e8c63b9c79a8bd3ced12ea5d' (2023-09-09)
  → 'github:tweag/topiary/7e6cb4f8b505eacee57aaf3c1ab0f3cf539da159' (2023-09-14)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>