UPM package + Update pod version

Author: Thaina

CONTRIBUTING.md.meta

@@ -0,0 +1,3 @@
+{
+	"name": "GoogleSignin"
+}

GoogleSignIn.asmdef

@@ -12,8 +12,7 @@
 
   <!-- iOS Cocoapod dependencies can be specified by each iosPod element. -->
   <iosPods>
-    <iosPod name="GoogleSignIn" version="~> 6.0.2" bitcodeEnabled="false"
-        minTargetSdk="6.0">
+    <iosPod name="GoogleSignIn" version="~> 6.2.4" bitcodeEnabled="false" minTargetSdk="6.0">
     </iosPod>
   </iosPods>
 </dependencies>

GoogleSignIn.asmdef.meta

@@ -71,10 +71,10 @@ internal Future(FutureAPIImpl<T> impl) {
     /// <param name="tcs">Tcs.</param>
     internal IEnumerator WaitForResult(TaskCompletionSource<T> tcs) {
       yield return new WaitUntil(() => !Pending);
-      if (Status == GoogleSignInStatusCode.Canceled) {
+      if (Status == GoogleSignInStatusCode.CANCELED) {
         tcs.SetCanceled();
-      } else if (Status == GoogleSignInStatusCode.Success ||
-            Status == GoogleSignInStatusCode.SuccessCached) {
+      } else if (Status == GoogleSignInStatusCode.SUCCESS ||
+            Status == GoogleSignInStatusCode.SUCCESS_CACHE) {
         tcs.SetResult(Result);
       } else {
         tcs.SetException(new GoogleSignIn.SignInException(Status));