flake.lock: Update

closes #19

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/59cf3f1447cfc75087e7273b04b31e689a8599fb' (2023-08-01)
  → 'github:hercules-ci/flake-parts/f7b3c975cf067e56e7cda6cb098ebe3fb4d74ca2' (2024-03-01)
• Updated input 'flake-parts/nixpkgs-lib':
    'github:NixOS/nixpkgs/9e1960bc196baf6881340d53dccb203a951745a2?dir=lib' (2023-08-01)
  → 'github:NixOS/nixpkgs/1536926ef5621b09bba54035ae2bb6d806d72ac8?dir=lib' (2024-02-29)
• Updated input 'flatland':
    'github:StardustXR/flatland/3867067452761959a95497d6589f9336b347270c' (2023-09-08)
  → 'github:StardustXR/flatland/db1639bc6ca738bf9cb52f2c20159a612019454c' (2024-02-06)
• Updated input 'flatland/fenix':
    'github:nix-community/fenix/ee59e1c769657b1e27e608f8b981fa8f6b715583' (2023-03-14)
  → 'github:nix-community/fenix/4378e7e5f5bdef438eee5ce967f37593b9b5cd16' (2023-11-16)
• Updated input 'flatland/fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/95497533524537b1cc7a2870ce94b0b14503be8b' (2023-03-13)
  → 'github:rust-lang/rust-analyzer/58de0b130a763f3a2d373f508ac0c18a8e7d0acd' (2023-11-15)
• Updated input 'flatland/nixpkgs':
    'github:NixOS/nixpkgs/67f26c1cfc5d5783628231e776a81c1ade623e0b' (2023-03-13)
  → 'github:NixOS/nixpkgs/e44462d6021bfe23dfb24b775cc7c390844f773d' (2023-11-12)
• Updated input 'hercules-ci-effects':
    'github:hercules-ci/hercules-ci-effects/0a63bfa3f00a3775ea3a6722b247880f1ffe91ce' (2023-07-15)
  → 'github:hercules-ci/hercules-ci-effects/0ca27bd58e4d5be3135a4bef66b582e57abe8f4a' (2024-02-21)
• Updated input 'hercules-ci-effects/flake-parts':
    'github:hercules-ci/flake-parts/8e8d955c22df93dbe24f19ea04f47a74adbdc5ec' (2023-07-04)
  → 'github:hercules-ci/flake-parts/34fed993f1674c8d06d58b37ce1e0fe5eebcb9f5' (2023-12-01)
• Updated input 'hercules-ci-effects/flake-parts/nixpkgs-lib':
    'github:NixOS/nixpkgs/4bc72cae107788bf3f24f30db2e2f685c9298dc9?dir=lib' (2023-06-29)
  → follows 'hercules-ci-effects/nixpkgs'
• Removed input 'hercules-ci-effects/hercules-ci-agent'
• Removed input 'hercules-ci-effects/hercules-ci-agent/flake-parts'
• Removed input 'hercules-ci-effects/hercules-ci-agent/flake-parts/nixpkgs-lib'
• Removed input 'hercules-ci-effects/hercules-ci-agent/haskell-flake'
• Removed input 'hercules-ci-effects/hercules-ci-agent/nixpkgs'
• Updated input 'hercules-ci-effects/nixpkgs':
    'github:NixOS/nixpkgs/27fcd46fa18df36d270174246e7bd8f1787129ff' (2023-07-15)
  → 'github:NixOS/nixpkgs/cfc3698c31b1fb9cdcf10f36c9643460264d0ca8' (2023-12-27)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/b85ed9dcbf187b909ef7964774f8847d554fab3b' (2023-08-22)
  → 'github:nixos/nixpkgs/1536926ef5621b09bba54035ae2bb6d806d72ac8' (2024-02-29)