[release-26.05] Bump flake.lock, testFlake/flake.lock, and Cargo.lock (#524)

* flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/9f78f44a87948854445dae0b6bf82b2e87e4efb5?narHash=sha256-rG5HKMAgAhMgydvKGtco6rqTxRq4EDZQCx9USLvVqYw%3D' (2026-08-12)
  → 'github:NixOS/nixpkgs/c5c4a43b0e8056328ec4529f735cabdb8f1942bb?narHash=sha256-u6z9VTZA4Kf3RkHQo9sQI7NI4Ei/uiU9vrMqOiwWP1Y%3D' (2026-08-29)

* testFlake/flake.lock: Update

Flake lock file updates:

• Updated input 'home-manager':
    'github:nix-community/home-manager/d4fd24667c8cbef124bb70a20380cab75ec8474d?narHash=sha256-Rgs2xKnGLFWQscxUaXX07oyZeuMDOHEbqDOsgliLFGM%3D' (2026-07-27)
  → 'github:nix-community/home-manager/65258d5c65a250189fde2e35f490d15e064c4c62?narHash=sha256-Sxu1NLTD/Ern6hFGLlZmtKCSct3YQXZI/lls8RE1XeM%3D' (2026-08-22)
• Updated input 'nix-vm-test':
    'github:numtide/nix-vm-test/1a587212d2ac8b669c6c32499015f996506b6ba5?narHash=sha256-cq4YfNFGYzp0NItZP8tEC7xUI8OSgY4fj75AU/NSaPM%3D' (2026-07-05)
  → 'github:numtide/nix-vm-test/c8781a0ea2d8417506fff7722eae5a6316461212?narHash=sha256-9QqhmaLVsPhKdMSBaWKjDqeGRn8G4ov4cVuZ6JFwXbo%3D' (2026-08-14)
• Updated input 'sops-nix':
    'github:Mic92/sops-nix/d1337e05ba0a8e88a75d2c0e1595d82f3b3e2ac4?narHash=sha256-G7qDAT98nywA4EFmJCwIRO5wKvDlBBN3BWpsOnjAto8%3D' (2026-08-10)
  → 'github:Mic92/sops-nix/a8627b21b9107c5711c96b84f32a9a4b3d45295f?narHash=sha256-gkig4nPi1CWc4Z50GBsjE4ygSE7hMpl/TwID2an2Cck%3D' (2026-08-13)
• Updated input 'system-manager':
    'path:..'
  → 'path:..'
• Updated input 'system-manager/nixpkgs':
    'github:NixOS/nixpkgs/9f78f44a87948854445dae0b6bf82b2e87e4efb5?narHash=sha256-rG5HKMAgAhMgydvKGtco6rqTxRq4EDZQCx9USLvVqYw%3D' (2026-08-12)
  → 'github:NixOS/nixpkgs/c5c4a43b0e8056328ec4529f735cabdb8f1942bb?narHash=sha256-u6z9VTZA4Kf3RkHQo9sQI7NI4Ei/uiU9vrMqOiwWP1Y%3D' (2026-08-29)

* cargo update

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

Author: github-actions[bot]