[maintenance] replace deprecated openURL method

* openURL: is completely deprecated on ios 18, so replace with the updated openURL:options:completionHandler:

Author: nan-li

iOS_SDK/OneSignalSDK/Source/OneSignalHelper.m

@@ -544,7 +544,7 @@ + (void)displayWebView:(NSURL*)url {
                     [webVC showInApp];
                 } else {
                     // Keep dispatch_async. Without this the url can take an extra 2 to 10 secounds to open.
-                    [[UIApplication sharedApplication] openURL:url];
+                    [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];
                 }
             });
         }];

iOS_SDK/OneSignalSDK/Source/OneSignalLocation.m

@@ -293,10 +293,7 @@ + (void)showLocationSettingsAlertController {
     [[OneSignalDialogController sharedInstance] presentDialogWithTitle:@"Location Not Available" withMessage:@"You have previously denied sharing your device location. Please go to settings to enable." withActions:@[@"Open Settings"] cancelTitle:@"Cancel" withActionCompletion:^(int tappedActionIndex) {
         if (tappedActionIndex > -1) {
             [OneSignal onesignalLog:ONE_S_LL_DEBUG message:@"CLLocationManage open settings option click"];
-            #pragma clang diagnostic push
-            #pragma clang diagnostic ignored "-Wdeprecated"
-            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
-            #pragma clang diagnostic pop
+            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString] options:@{} completionHandler:nil];
         }
         [OneSignalLocation sendAndClearLocationListener:false];
         return;