Update dependency go to v1.23.12 (#814)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [go](https://go.dev/) ([source](https://github.com/golang/go)) | toolchain | patch | `1.23.11` -> `1.23.12` |

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Reviewed-on: https://code.forgejo.org/forgejo/runner/pulls/814
Reviewed-by: earl-warren <[email protected]>
Co-authored-by: Renovate Bot <[email protected]>
Co-committed-by: Renovate Bot <[email protected]>

Author: viceice-bot

go.mod

@@ -2,7 +2,7 @@ module code.forgejo.org/forgejo/runner/v9
 
 go 1.23.0
 
-toolchain go1.23.11
+toolchain go1.23.12
 
 require (
 	code.forgejo.org/forgejo/actions-proto v0.5.1