Merge #103

103: Update rust-overlay in flake.lock r=matthiasbeyer a=github-actions[bot]

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

```
Flake lock file updates:

• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/603a1600324f9b4511d7ab5bdc38cb14ba8370a5' (2023-08-21)
  → 'github:oxalica/rust-overlay/23756b2c5594da5c1ad2f40ae2440b9f8a2165b7' (2023-08-28)
```

### 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>