Update flake.lock and Cargo.lock

[github-actions]

https://github.com/moss-lang/moss/actions/runs/36245899617

unpacking 'github:NixOS/nixpkgs/d54020a6ac3211e9f4201631bdf67678818c0cdf' into the Git cache...
unpacking 'github:oxalica/rust-overlay/4e9bb05a9ab6c37dc74c22974ebed6e36dc73eb2' into the Git cache...
warning: updating lock file "/home/runner/work/moss/moss/flake.lock":
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/a32edd7654519351e48e80372a928df336394670?narHash=sha256-RjR8AyvGlWuw16XRj7C1YDEw4E27ciuyPeB2nDMzgTU%3D' (2026-09-17)
  → 'github:NixOS/nixpkgs/d54020a6ac3211e9f4201631bdf67678818c0cdf?narHash=sha256-StRyS/lFHtIw/UgJk%2Bxo%2BHA66mtoWeDUbkJdvf2Byn4%3D' (2026-09-26)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/26a71e661c47bd21a05d06fec749f3f7c75e9d12?narHash=sha256-QVFfArbYaQMGK4dFV%2B5RUL72Ci%2BhNHVhaF/R9qJfDhs%3D' (2026-09-19)
  → 'github:oxalica/rust-overlay/4e9bb05a9ab6c37dc74c22974ebed6e36dc73eb2?narHash=sha256-M8elY2UShg4ZuLTiRLEHO%2Bae5xQFp3/ReQdxp/R%2B1UU%3D' (2026-09-26)

    Updating crates.io index
     Locking 0 packages to latest compatible versions
   Unchanged generic-array v0.14.7 (available: v0.14.9)
   Unchanged sha2 v0.10.9 (available: v0.11.0)
note: to see how you depend on a package, run `cargo tree --invert <dep>@<ver>`