Update Go version to 1.21

.github/workflows/basic.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/setup-go@v2
         with:
           stable: true
-          go-version: 1.16.x
+          go-version: 1.21.x
       - uses: actions/checkout@v2
       - name: run go mod
         run: go mod tidy && go build

go.mod

@@ -1,8 +1,14 @@
 module github.com/nndi-oss/dialoguss
 
-go 1.16
+go 1.21
 
 require (
 	github.com/stretchr/testify v1.8.0
 	gopkg.in/yaml.v2 v2.2.2
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)