Update minimum go to 1.19

This is what gio requires.

Switch to v4 action to use the latest go versions

.github/workflows/go.yml

@@ -8,12 +8,12 @@ jobs:
     timeout-minutes: 3
     strategy:
       matrix:
-        go-version: [1.19.3, 1.18.8]
+        go-version: [stable, oldstable]
         os: [ubuntu-latest]
 
     steps:
     - name: Set up Go
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v4
       with:
         go-version: ${{ matrix.go-version }}
       id: go

go.mod

@@ -1,18 +1,32 @@
 module github.com/psanford/wormhole-william-mobile
 
-go 1.16
+go 1.19
 
 require (
 	gioui.org v0.2.0
 	gioui.org/cmd v0.0.0-20230711191157-4128f253e857
 	git.wow.st/gmp/jni v0.0.0-20210610011705-34026c7e22d0
+	github.com/psanford/wormhole-william v1.0.6
+	golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91
+)
+
+require (
+	gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 // indirect
+	gioui.org/shader v1.0.6 // indirect
+	github.com/akavel/rsrc v0.10.1 // indirect
+	github.com/go-text/typesetting v0.0.0-20230803102845-24e03d8b5372 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/compress v1.13.6 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
-	github.com/psanford/wormhole-william v1.0.6
+	golang.org/x/crypto v0.1.0 // indirect
 	golang.org/x/exp v0.0.0-20221028150844-83b7d23a625f // indirect
-	golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91
+	golang.org/x/image v0.5.0 // indirect
+	golang.org/x/mod v0.6.0 // indirect
+	golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4 // indirect
+	golang.org/x/sys v0.1.0 // indirect
+	golang.org/x/text v0.7.0 // indirect
+	golang.org/x/tools v0.2.0 // indirect
 	google.golang.org/protobuf v1.27.1 // indirect
 	nhooyr.io/websocket v1.8.7 // indirect
 	salsa.debian.org/vasudev/gospake2 v0.0.0-20210510093858-d91629950ad1 // indirect