chore(deps): update dependency gohugoio/hugo to v0.88.1 (#16)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [gohugoio/hugo](https://github.com/gohugoio/hugo) | patch | `v0.88.0` -> `v0.88.1` |

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### Release Notes

<details>
<summary>gohugoio/hugo</summary>

### [`v0.88.1`](https://github.com/gohugoio/hugo/releases/v0.88.1)

[Compare Source](https://github.com/gohugoio/hugo/compare/v0.88.0...v0.88.1)

This is a bug-fix release with one important fix.

-   Bump down again to Go 1.16.7 for the release builds [e1ead4db](e1ead4dbca) [@&#8203;bep](https://github.com/bep) [#&#8203;8952](https://github.com/gohugoio/hugo/issues/8952)[#&#8203;8955](https://github.com/gohugoio/hugo/issues/8955)

</details>

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### Configuration

📅 **Schedule**: 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.

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 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box.

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

Reviewed-on: docker/hugo#16
Co-authored-by: Renovator Bot <renovator@rknet.org>
Co-committed-by: Renovator Bot <renovator@rknet.org>

Dockerfile

@@ -10,7 +10,7 @@ LABEL org.opencontainers.image.documentation="https://gitea.rknet.org/docker/hug
 ARG BUILD_VERSION
 
 # renovate: datasource=github-releases depName=gohugoio/hugo
-ENV HUGO_VERSION="${BUILD_VERSION:-v0.88.0}"
+ENV HUGO_VERSION="${BUILD_VERSION:-v0.88.1}"
 
 ENV HUGO_ENV=production