chore: daily flake.lock update (#5602)

Automated changes by the
[update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock)
GitHub Action.
as defined in
[.github/workflows/update-flake-lock.yml](https://github.com/dfinity/motoko/blob/master/.github/workflows/update-flake-lock.yml)
and run in:
https://github.com/dfinity/motoko/actions/runs/19154117279/attempts/1:

```
Flake lock file updates:

• Updated input 'motoko-core-src':
    'github:dfinity/motoko-core/c707f40fe514bbde9a33869e71a86c6d36ce7e32?narHash=sha256-knLQ0jGi0OcZTEmhRFSaUjqQkrOJZ4eGKJhGc3o%2B8IE%3D' (2025-10-28)
  → 'github:dfinity/motoko-core/090cb32236f74ba0f998df2694f4919a496678d8?narHash=sha256-MGnkO3LPdcIlCpW/S%2BhURehYKUQRHnbVoDTw8/PoR20%3D' (2025-11-06)
```

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

Author: pr-automation-bot-public[bot]