flake.lock: Update (#1964)

Automated changes by the
[update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock)
GitHub Action.

```
Flake lock file updates:

• Updated input 'git-hooks-nix':
    'github:cachix/git-hooks.nix/5eaaedde414f6eb1aea8b8525c466dc37bba95ae?narHash=sha256-kck%2BvIbGOaM/dHea7aTBxdFYpeUl/jHOy5W3eyRvVx8%3D' (2026-02-10)
  → 'github:cachix/git-hooks.nix/6e34e97ed9788b17796ee43ccdbaf871a5c2b476?narHash=sha256-%2BeXlIc4/7dE6EcPs9a2DaSY3fTA9AE526hGqkNID3Wg%3D' (2026-02-25)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/6e30976c6657068a49858eb1071e6fcf83b9795b?narHash=sha256-zC%2BRkVpsZgElcL4IJfDewGFnkh1QuimKGguDxJm%2BO4c%3D' (2026-02-21)
  → 'github:NixOS/nixpkgs/2fda184255d09ea80e9ac0352d97f12ac1500a33?narHash=sha256-6wrHqFXefzvxopkb80vg3ePRy9jwB6FVcwgTqS2BnC0%3D' (2026-02-28)
• Updated input 'released-nix-unstable':
    'github:nixos/nix/761139f31c9800243e358884efcfdac3ac8db228?narHash=sha256-s745h7KE6wenL9kzUiiDvgZuSrT1H%2BiVoXxah0nTEDI%3D' (2026-02-21)
  → 'github:nixos/nix/0acd0566e85e4597269482824711bcde7b518600?narHash=sha256-jJIlRLPPVYu860MVFx4gsRx3sskmLDSRWXXue5tYncw%3D' (2026-02-27)
• Updated input 'released-nix-unstable/nixpkgs':
    'https://releases.nixos.org/nixos/25.11/nixos-25.11.5960.3aadb7ca9eac/nixexprs.tar.xz?narHash=sha256-WoiezqWJQ3OHILah%2Bp6rzNXdJceEAmAhyDFZFZ6pZzY%3D' (2026-02-14)
  → 'https://releases.nixos.org/nixos/25.11/nixos-25.11.6495.e764fc9a4058/nixexprs.tar.xz?narHash=sha256-jEA8WggGKtMFeNeCKq3NK8cLEjJmG6/RLUElYYbBZ0E%3D' (2026-02-24)
• Updated input 'released-nixpkgs-stable':
    'github:NixOS/nixpkgs/c217913993d6c6f6805c3b1a3bda5e639adfde6d?narHash=sha256-D1PA3xQv/s4W3lnR9yJFSld8UOLr0a/cBWMQMXS%2B1Qg%3D' (2026-02-20)
  → 'github:NixOS/nixpkgs/1267bb4920d0fc06ea916734c11b0bf004bbe17e?narHash=sha256-7DaQVv4R97cii/Qdfy4tmDZMB2xxtyIvNGSwXBBhSmo%3D' (2026-02-25)
• Updated input 'released-nixpkgs-unstable':
    'github:NixOS/nixpkgs/0182a361324364ae3f436a63005877674cf45efb?narHash=sha256-0NBlEBKkN3lufyvFegY4TYv5mCNHbi5OmBDrzihbBMQ%3D' (2026-02-17)
  → 'github:NixOS/nixpkgs/dd9b079222d43e1943b6ebd802f04fd959dc8e61?narHash=sha256-I45esRSssFtJ8p/gLHUZ1OUaaTaVLluNkABkk6arQwE%3D' (2026-02-27)
```

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