chore(deps): update go toolchain directive to v1.27.4 (#40315) (#40318)

Backport #40315 by @GiteaBot

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [go](https://go.dev/)
([source](https://redirect.github.com/golang/go)) | toolchain | patch |
`1.27.3` → `1.27.4` |

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go.mod

@@ -2,7 +2,7 @@ module gitea.dev
 
 go 1.27
 
-toolchain go1.27.3
+toolchain go1.27.4
 
 require (
 	connectrpc.com/connect v1.21.0