cookifed/base-image: Base image for our CI runner. - Codeberg.org

This PR contains the following updates:
| Package | Type | Update | Change |
|---|---|---|---|
| [https://data.forgejo.org/actions/cache](https://data.forgejo.org/actions/cache) | action | minor | `v6.0.0` → `v6.1.0` |
---
### Release Notes
<details>
<summary>actions/cache (https://data.forgejo.org/actions/cache)</summary>
### [`v6.1.0`](https://data.forgejo.org/actions/cache/compare/v6...v6.1.0)
[Compare Source](https://data.forgejo.org/actions/cache/compare/v6...v6.1.0)
</details>
---
### Configuration
📅 **Schedule**: (UTC)
- Branch creation
 - At any time (no schedule defined)
- Automerge
 - At any time (no schedule defined)
🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.
♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 **Ignore**: Close this PR and you won't be reminded about this update again.
---
 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box
---
This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4yNDQuMyIsInVwZGF0ZWRJblZlciI6IjQzLjI0NC4zIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->
Co-authored-by: Renovate Bot <forgejo-renovate-action@cookifed.dev>
Reviewed-on: #15