为什么从 Go 1.17 开始在 go.mod 中有两个require块

我已经创建了小型围棋应用程序.几天前，我把go 1.15升级到了1.17，还升级了go get -u个软件包.更改后，我的围棋中有两个require块.mod文件.为什么？这是什么意思？还好吗，还是有东西坏了？

应用程序仍能正确构建.

go.mod file:

module github.com/jozo/simple-pomodoro

go 1.17

require (
    fyne.io/fyne/v2 v2.1.0
    github.com/dsnet/golib/memfile v1.0.0
    github.com/faiface/beep v1.1.0
    github.com/fsnotify/fsnotify v1.5.1 // indirect
    github.com/go-gl/gl v0.0.0-20210905235341-f7a045908259 // indirect
    github.com/go-gl/glfw/v3.3/glfw v0.0.0-20210727001814-0db043d8d5be // indirect
    github.com/godbus/dbus/v5 v5.0.5 // indirect
    github.com/hajimehoshi/oto v1.0.1 // indirect
    github.com/srwiley/oksvg v0.0.0-20210519022825-9fc0c575d5fe // indirect
    github.com/srwiley/rasterx v0.0.0-20210519020934-456a8d69b780 // indirect
    github.com/yuin/goldmark v1.4.1 // indirect
    golang.org/x/exp v0.0.0-20210916165020-5cb4fee858ee // indirect
    golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d // indirect
    golang.org/x/mobile v0.0.0-20210924032853-1c027f395ef7 // indirect
    golang.org/x/net v0.0.0-20210929193557-e81a3d93ecf6 // indirect
    golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6 // indirect
    golang.org/x/text v0.3.7 // indirect
    gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
)

require (
    github.com/davecgh/go-spew v1.1.1 // indirect
    github.com/fredbi/uri v0.0.0-20181227131451-3dcfdacbaaf3 // indirect
    github.com/goki/freetype v0.0.0-20181231101311-fa8a33aabaff // indirect
    github.com/pkg/errors v0.9.1 // indirect
    github.com/pmezard/go-difflib v1.0.0 // indirect
    github.com/stretchr/testify v1.7.0 // indirect
)