go log/slog: package log/slog is not in GOROOT

安装 iris v12版本需要 Golang >= 1.21

go get github.com/kataras/iris/v12@latest

github.com/kataras/iris/v12 imports
        github.com/kataras/golog imports
        log/slog: package log/slog is not in GOROOT (/usr/local/go/src/log/slog)

参考链接：https://go.dev/doc/go1.21#slog