Release v3.14.0 (#1729)

* Prepare release v3.14.0

* Update test fixtures with the new nix-installer version

* flake.lock: Update

Flake lock file updates:

• Updated input 'determinate':
    'https://api.flakehub.com/f/pinned/DeterminateSystems/determinate/3.13.2/019a9b01-c0c6-7e1c-959e-98ac5b7675de/source.tar.gz' (2025-11-19)
  → 'https://api.flakehub.com/f/pinned/DeterminateSystems/determinate/3.14.0/019b0160-c5de-7941-9c26-cb47bc17eec3/source.tar.gz' (2025-12-09)
• Updated input 'determinate/determinate-nixd-aarch64-darwin':
    'https://install.determinate.systems/determinate-nixd/tag/v3.13.2/macOS'
  → 'https://install.determinate.systems/determinate-nixd/tag/v3.14.0/macOS'
• Updated input 'determinate/determinate-nixd-aarch64-linux':
    'https://install.determinate.systems/determinate-nixd/tag/v3.13.2/aarch64-linux'
  → 'https://install.determinate.systems/determinate-nixd/tag/v3.14.0/aarch64-linux'
• Updated input 'determinate/determinate-nixd-x86_64-linux':
    'https://install.determinate.systems/determinate-nixd/tag/v3.13.2/x86_64-linux'
  → 'https://install.determinate.systems/determinate-nixd/tag/v3.14.0/x86_64-linux'
• Updated input 'nix':
    'https://api.flakehub.com/f/pinned/DeterminateSystems/nix-src/3.13.2/019a9af6-3d7b-71bc-bccd-8b18e147ad77/source.tar.gz' (2025-11-19)
  → 'https://api.flakehub.com/f/pinned/DeterminateSystems/nix-src/3.14.0/019b0159-8907-7fab-a120-9d287c7e6d2e/source.tar.gz' (2025-12-09)
• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.897910%2Brev-89c2b2330e733d6cdb5eae7b899326930c2c0648/019a9888-31f2-7667-abe4-5a1c43721ef0/source.tar.gz' (2025-11-17)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.907002%2Brev-f61125a668a320878494449750330ca58b78c557/019af28f-4a47-7f68-a9d7-f6f6e905b8ab/source.tar.gz' (2025-12-05)

* Update Cargo dependencies

* Set Cargo.toml package.version to 3.14.0

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]