flake.lock: downgrade latest Nix to 2.23 (#1540)

Flake lock file updates:

• Updated input 'released-nix-stable':

'github:nixos/nix/f1ab41b2bc2b070a5b9c1b7b4ef20cc7b84b1e58?narHash=sha256-mYvdPwl4gcc17UAomkbbOJEgxBQpowmJDrRMWtlYzFY%3D'
(2024-09-03)
→
'github:nixos/nix/f1deb42176cadfb412eb6f92315e6aeef7f2ad75?narHash=sha256-lAoLGVIhRFrfgv7wcyduEkyc83QKrtsfsq4of%2BWrBeg%3D'
(2024-07-05)
• Removed input 'released-nix-stable/git-hooks-nix' • Removed input
'released-nix-stable/git-hooks-nix/flake-compat' • Removed input
'released-nix-stable/git-hooks-nix/gitignore' • Removed input
'released-nix-stable/git-hooks-nix/nixpkgs' • Removed input
'released-nix-stable/git-hooks-nix/nixpkgs-stable' • Updated input
'released-nix-stable/libgit2':

'github:libgit2/libgit2/36f7e21ad757a3dacc58cf7944329da6bc1d6e96?narHash=sha256-J2rCxTecyLbbDdsyBWn9w7r3pbKRMkI9E7RvRgAqBdY%3D'
(2024-05-16)
→
'github:libgit2/libgit2/403a03b3beaea7d26b9515e27dd36553239647ca?narHash=sha256-fpQ%2Bykf7gAC5SQ5/7dojtarPrfVNEh6WlJAeWwcPUss%3D'
(2024-09-03)
• Updated input 'released-nix-stable/nixpkgs':

'github:NixOS/nixpkgs/c3d4ac725177c030b1e289015989da2ad9d56af0?narHash=sha256-sqLwJcHYeWLOeP/XoLwAtYjr01TISlkOfz%2BNG82pbdg%3D'
(2024-08-15)
→
'github:NixOS/nixpkgs/205fd4226592cc83fd4c0885a3e4c9c400efabb5?narHash=sha256-zwVvxrdIzralnSbcpghA92tWu2DV2lwv89xZc8MTrbg%3D'
(2024-07-09)
• Removed input 'released-nix-stable/nixpkgs-23-11' • Added input
'released-nix-stable/pre-commit-hooks':

'github:cachix/pre-commit-hooks.nix/7570de7b9b504cfe92025dd1be797bf546f66528?narHash=sha256-tyMUA6NgJSvvQuzB7A1Sf8%2B0XCHyfSPRx/b00o6K0uo%3D'
(2024-09-05)
• Added input 'released-nix-stable/pre-commit-hooks/flake-compat':
    follows 'released-nix-stable'
• Added input 'released-nix-stable/pre-commit-hooks/gitignore':
    follows 'released-nix-stable'
• Added input 'released-nix-stable/pre-commit-hooks/nixpkgs':
    follows 'released-nix-stable/nixpkgs'
• Added input 'released-nix-stable/pre-commit-hooks/nixpkgs-stable':
    follows 'released-nix-stable/nixpkgs'

---

(related: NixOS/nix.dev#1058)

EDIT: To validate it yourself, I ran the following to generate this
commit:

```
nix flake lock --override-input released-nix-stable github:nixos/nix/2.23.3 --commit-lock-file
```
(and manually amended the title)