Bump golang.org/x dependencies

The latest versions simplify the transitive dependency tree (see
kubernetes/kubernetes#113366 for details).

Signed-off-by: Stephen Kitt <skitt@redhat.com>

go.mod

@@ -4,6 +4,9 @@ go 1.14
 
 require (
 	github.com/go-jose/go-jose/v3 v3.0.0
-	golang.org/x/net v0.0.0-20220826154423-83b083e8dc8b
-	golang.org/x/oauth2 v0.0.0-20220822191816-0ebed06d0094
+	github.com/kr/pretty v0.1.0 // indirect
+	github.com/stretchr/testify v1.7.0 // indirect
+	golang.org/x/net v0.4.0
+	golang.org/x/oauth2 v0.3.0
+	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 )