Update golang packages to v1.25 (v11.0/forgejo) (minor) (#9821)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [go](https://go.dev/) ([source](https://github.com/golang/go)) | toolchain | minor | `1.24.6` -> `1.25.3` |
| [go](https://go.dev/) ([source](https://github.com/golang/go)) | golang | minor | `1.24` -> `1.25` |

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Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/9821
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
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 forgejo.org
 
 go 1.24
 
-toolchain go1.24.6
+toolchain go1.25.3
 
 require (
 	code.forgejo.org/f3/gof3/v3 v3.10.6