Update dependency go to v1.23.6 (forgejo) (#6785)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [go](https://go.dev/) ([source](https://github.com/golang/go)) | toolchain | patch | `1.23.5` -> `1.23.6` |

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Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6785
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Co-committed-by: Renovate Bot <forgejo-renovate-action@forgejo.org>