flake.lock: Update (#1537)

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

```
Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/71e91c409d1e654808b2621f28a327acfdad8dc2?narHash=sha256-GnR7/ibgIH1vhoy8cYdmXE6iyZqKqFxQSVkFgosBh6w%3D' (2024-08-28)
  → 'github:NixOS/nixpkgs/574d1eac1c200690e27b8eb4e24887f8df7ac27c?narHash=sha256-v3rIhsJBOMLR8e/RNWxr828tB%2BWywYIoajrZKFM%2B0Gg%3D' (2024-09-06)
• Updated input 'released-nix-stable':
    'github:nixos/nix/cb0439f0c2d28f971369365d0937dbfaa76b0cce?narHash=sha256-oYu/9u8ht34JOTV%2BG/l3CCFJokPiUA2D8CiLZFX61PA%3D' (2024-08-23)
  → 'github:nixos/nix/f1ab41b2bc2b070a5b9c1b7b4ef20cc7b84b1e58?narHash=sha256-mYvdPwl4gcc17UAomkbbOJEgxBQpowmJDrRMWtlYzFY%3D' (2024-09-03)
• Updated input 'released-nix-unstable':
    'github:nixos/nix/b89eca9aecc69d4dfc0f0afd9353c126eb7b5858?narHash=sha256-cmmNq/tFU4MZYU5RAuUVt1NGt5e6RMaMsvJtU5ybEJI%3D' (2024-08-28)
  → 'github:nixos/nix/9ae7140beb3c0805ea1441c2ffbbb9428afd6026?narHash=sha256-JpWtq0lpy3FBRv/UXcV2ckg3FVC5yXWf/fm8vL5m3zY%3D' (2024-09-07)
• Updated input 'released-nixpkgs-stable':
    'github:NixOS/nixpkgs/6e99f2a27d600612004fbd2c3282d614bfee6421?narHash=sha256-eV%2B63gK0Mp7ygCR0Oy4yIYSNcum2VQwnZamHxYTNi%2BM%3D' (2024-08-30)
  → 'github:NixOS/nixpkgs/6f6c45b5134a8ee2e465164811e451dcb5ad86e3?narHash=sha256-tiN5Rlg/jiY0tyky%2BsoJZoRzLKbPyIdlQ77xVgREDNM%3D' (2024-09-03)
• Updated input 'released-nixpkgs-unstable':
    'github:NixOS/nixpkgs/71e91c409d1e654808b2621f28a327acfdad8dc2?narHash=sha256-GnR7/ibgIH1vhoy8cYdmXE6iyZqKqFxQSVkFgosBh6w%3D' (2024-08-28)
  → 'github:NixOS/nixpkgs/574d1eac1c200690e27b8eb4e24887f8df7ac27c?narHash=sha256-v3rIhsJBOMLR8e/RNWxr828tB%2BWywYIoajrZKFM%2B0Gg%3D' (2024-09-06)
```

### Running GitHub Actions on this PR

GitHub Actions will not run workflows on pull requests which are opened
by a GitHub Action.

To run GitHub Actions workflows on this PR, run:

```sh
git branch -D update_flake_lock_action
git fetch origin
git checkout update_flake_lock_action
git commit --amend --no-edit
git push origin update_flake_lock_action --force
```

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