Update google auth endpoint to v2 #1307

Author: Tratcher

src/Microsoft.AspNetCore.Authentication.Google/GoogleDefaults.cs

@@ -12,7 +12,7 @@ public static class GoogleDefaults
 
         public static readonly string DisplayName = "Google";
 
-        public static readonly string AuthorizationEndpoint = "https://accounts.google.com/o/oauth2/auth";
+        public static readonly string AuthorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth";
 
         public static readonly string TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token";
 

test/Microsoft.AspNetCore.Authentication.Test/GoogleTests.cs

@@ -457,7 +457,7 @@ public async Task ChallengeWillTriggerRedirection()
             var transaction = await server.SendAsync("https://example.com/challenge");
             Assert.Equal(HttpStatusCode.Redirect, transaction.Response.StatusCode);
             var location = transaction.Response.Headers.Location.ToString();
-            Assert.Contains("https://accounts.google.com/o/oauth2/auth?response_type=code", location);
+            Assert.Contains("https://accounts.google.com/o/oauth2/v2/auth?response_type=code", location);
             Assert.Contains("&client_id=", location);
             Assert.Contains("&redirect_uri=", location);
             Assert.Contains("&scope=", location);