Step back to go 1.14

Fyne continues to maintain the compatibilty with Go 1.14. Even if it's
not the case for Go-GST, we prefer to follow the rule.

Note that contributors can update go.mod using:
`go mod tidy -compat="1.14"`

go.mod

@@ -1,40 +1,22 @@
 module github.com/metal3d/fyne-streamer
 
-go 1.20
+go 1.14
 
 require (
 	fyne.io/fyne/v2 v2.4.1
 	github.com/go-gst/go-glib v0.0.0-20230906175327-b2d34240bcb4
 	github.com/go-gst/go-gst v0.0.0-20231009181223-aa872b0f6c0c
+	github.com/stretchr/testify v1.8.4
 )
 
 require (
-	fyne.io/systray v1.10.1-0.20230722100817-88df1e0ffa9a // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fredbi/uri v1.1.0 // indirect
-	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/fyne-io/gl-js v0.0.0-20230506162202-1fdaa286a934 // indirect
 	github.com/fyne-io/glfw-js v0.0.0-20220517201726-bebc2019cd33 // indirect
 	github.com/fyne-io/image v0.0.0-20230811065323-ed435dc8bca6 // indirect
-	github.com/go-gl/gl v0.0.0-20211210172815-726fda9656d6 // indirect
-	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20221017161538-93cebf72946b // indirect
-	github.com/go-text/render v0.0.0-20230619120952-35bccb6164b8 // indirect
 	github.com/go-text/typesetting v0.0.0-20231013144250-6cc35dbfae7d // indirect
-	github.com/godbus/dbus/v5 v5.1.0 // indirect
-	github.com/gopherjs/gopherjs v1.17.2 // indirect
-	github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25 // indirect
-	github.com/mattn/go-pointer v0.0.1 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c // indirect
-	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef // indirect
-	github.com/stretchr/testify v1.8.4 // indirect
-	github.com/tevino/abool v1.2.0 // indirect
 	github.com/yuin/goldmark v1.5.6 // indirect
-	golang.org/x/image v0.13.0 // indirect
 	golang.org/x/mobile v0.0.0-20231006135142-2b44d11868fe // indirect
 	golang.org/x/net v0.17.0 // indirect
-	golang.org/x/sys v0.13.0 // indirect
-	golang.org/x/text v0.13.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 	honnef.co/go/js/dom v0.0.0-20230808055721-96db8f4d5e3b // indirect
 )