UIWebView still exist in Google Mobile Ads

Hi! I hope you guys are fine and doing great. I am trying to build my game for IOS but after uploading to ITuneconnect i got this message.
ITMS-90809: Deprecated API Usage - New apps that use UIWebView are no longer accepted. Instead, use WKWebView for improved security and reliability. Learn more (https://developer.apple.com/documentation/uikit/uiwebview).

I know this problem exist already. I searched my Project using this command

grep -r "UIWebView" .

I got these two matches

Binary file ./Libraries/libiPhone-lib.a matches

Binary file ./GoogleMobileAds.framework/GoogleMobileAds matches

I am using latest version of Google mobile ads (7.61), as Google mentioned in released notes that they have remove UIWebView in 7.55 and i am using 7.61. I searched in 7.61 IOS framework, UI WebView Still there. I am using Unity 2019.2.2f1 Please let me know how can i solve this problem. I am very tired to this problem. Its very long procedure to get build for IOS and they told the problem when we uploaded it itune instead they should told us while compling.