Update dependencies

Among others, this updates minio-go, so that the new "eu-west-3" zone
for AWS is supported.

vendor/golang.org/x/oauth2/internal/token_test.go

@@ -6,6 +6,7 @@ package internal
 
 import (
 	"fmt"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -32,6 +33,8 @@ func TestRetrieveTokenBustedNoSecret(t *testing.T) {
 		if got, want := r.FormValue("client_secret"), ""; got != want {
 			t.Errorf("client_secret = %q; want empty", got)
 		}
+		w.Header().Set("Content-Type", "application/json")
+		io.WriteString(w, `{"access_token": "ACCESS_TOKEN", "token_type": "bearer"}`)
 	}))
 	defer ts.Close()
 
@@ -82,7 +85,10 @@ func TestProviderAuthHeaderWorksDomain(t *testing.T) {
 func TestRetrieveTokenWithContexts(t *testing.T) {
 	const clientID = "client-id"
 
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		io.WriteString(w, `{"access_token": "ACCESS_TOKEN", "token_type": "bearer"}`)
+	}))
 	defer ts.Close()
 
 	_, err := RetrieveToken(context.Background(), clientID, "", ts.URL, url.Values{})
@@ -90,14 +96,16 @@ func TestRetrieveTokenWithContexts(t *testing.T) {
 		t.Errorf("RetrieveToken (with background context) = %v; want no error", err)
 	}
 
-	ctx, cancelfunc := context.WithCancel(context.Background())
-
+	retrieved := make(chan struct{})
 	cancellingts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		cancelfunc()
+		<-retrieved
 	}))
 	defer cancellingts.Close()
 
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
 	_, err = RetrieveToken(ctx, clientID, "", cancellingts.URL, url.Values{})
+	close(retrieved)
 	if err == nil {
 		t.Errorf("RetrieveToken (with cancelled context) = nil; want error")
 	}