Update flake.lock and Cargo.lock

[github-actions]

https://github.com/moss-lang/moss/actions/runs/34694433512

unpacking 'github:NixOS/nixpkgs/aff8a0b28396750446e5537a96461bc4facdb287' into the Git cache...
unpacking 'github:oxalica/rust-overlay/228ecefb6329d5a531b77b46b581a2f0c26ee056' into the Git cache...
warning: updating lock file "/home/runner/work/moss/moss/flake.lock":
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/391b592eb44808b3bd0cb80bb71b63a5a118b8bb?narHash=sha256-WvvHR4kSQLAbtouMC/ruZ5UpLwlUcY3K4FAllMN%2ByGk%3D' (2026-08-20)
  → 'github:NixOS/nixpkgs/aff8a0b28396750446e5537a96461bc4facdb287?narHash=sha256-xfX/toC2QV707s06GbP4II/TxYF0fNQj7s5/LClNDKc%3D' (2026-09-10)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/fd2ebb9cc4323d0c5a1336138dab5c3c5a5d8bd9?narHash=sha256-YT4Fs2k7bi%2B7YzuLt93EtIRgjpwHK5ZfsQEIh5dEQSk%3D' (2026-08-22)
  → 'github:oxalica/rust-overlay/228ecefb6329d5a531b77b46b581a2f0c26ee056?narHash=sha256-yJr1Bt4fKkKIpPYbsKGqJ0VFdoDnURgRwuffmBQ2WzY%3D' (2026-09-12)

    Updating crates.io index
     Locking 1 package to latest compatible version
   Unchanged generic-array v0.14.7 (available: v0.14.9)
   Unchanged sha2 v0.10.9 (available: v0.11.0)
    Updating syn v3.0.3 -> v3.0.5
note: to see how you depend on a package, run `cargo tree --invert <dep>@<ver>`