build(deps): update dlvhdr/diffnav to v0.6.0

This MR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [dlvhdr/diffnav](https://github.com/dlvhdr/diffnav) | minor | `v0.5.0` → `v0.6.0` |

MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot).

**Proposed changes to behavior should be submitted there as MRs.**

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### Release Notes

<details>
<summary>dlvhdr/diffnav (dlvhdr/diffnav)</summary>

### [`v0.6.0`](https://github.com/dlvhdr/diffnav/releases/tag/v0.6.0)

[Compare Source](dlvhdr/diffnav@v0.5.0...v0.6.0)

### Unified Diff Mode Toggle

Thanks to [@&#8203;markdorison](https://github.com/markdorison) 🙏🏽 `diffnav` now supports toggling between side-by-side and unified diff modes.
Press <kbd>s</kbd> to switch between the two or use the `--side-by-side` and `--unified` flags.
You can also set this in the config file under `ui.sideBySide`.

#### Changelog

- [`4bfcf87`](dlvhdr/diffnav@4bfcf87) feat: add unified diff view option ([#&#8203;63](dlvhdr/diffnav#63))

</details>

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### Configuration

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🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this MR and you won't be reminded about this update again.

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Author: ECG Bot

chezmoi/dot_config/aquaproj-aqua/aqua.yaml

@@ -221,7 +221,7 @@ packages:
 - name: phiresky/[email protected]
   description: "rga: ripgrep, but also search in PDFs, E-Books, Office documents, zip, tar.gz, etc"
   link: https://github.com/phiresky/ripgrep-all
-- name: dlvhdr/diffnav@v0.5.0
+- name: dlvhdr/diffnav@v0.6.0
   description: A git diff pager based on delta but with a file tree, à la GitHub
   link: https://github.com/dlvhdr/diffnav
 - name: achristmascarl/[email protected]