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/9ca3f649614213b2aaf5f1e16ec06952fe4c2632?narHash=sha256-7EXDb5WBw%2Bd004Agt%2BJHC/Oyh/KTUglOaQ4MNjBbo5w%3D' (2024-05-27)
→ 'github:nixos/nixpkgs/71e91c409d1e654808b2621f28a327acfdad8dc2?narHash=sha256-GnR7/ibgIH1vhoy8cYdmXE6iyZqKqFxQSVkFgosBh6w%3D' (2024-08-28)
```
### 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
```
---------
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
This PR irons out the last issues with the backup contract and the
Restic implementation.
I could check it works backing up files to a local folder and to
Backblaze on my server.
