ci(mise): go backend no longer experimental (#1283)

The `go` backend is no longer experimental:
https://github.com/jdx/mise/releases/tag/v2025.10.11

Author: phm07

mise.toml

@@ -5,7 +5,3 @@ go = "1.25.5"
 "github:goreleaser/goreleaser" = "v2.13.1"
 "github:anchore/quill" = "v0.5.1"
 "github:jstemmer/go-junit-report" = "v2.1.0"
-
-[settings]
-# Experimental features are needed for the Go backend
-experimental = true