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
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Renovate Bot <forgejo-renovate-action@forgejo.org>
Co-committed-by: Renovate Bot <forgejo-renovate-action@forgejo.org>

go.mod

@@ -2,7 +2,7 @@ module code.gitea.io/gitea
 
 go 1.23
 
-toolchain go1.23.5
+toolchain go1.23.6
 
 require (
 	code.forgejo.org/f3/gof3/v3 v3.10.2