chore(ios): follow SPM version

Author: rdlabo

Package.swift

@@ -11,7 +11,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/ionic-team/capacitor-swift-pm.git", from: "7.0.0"),
-        .package(url: "https://github.com/googleads/swift-package-manager-google-mobile-ads.git", from: "12.7.0"),
+        .package(url: "https://github.com/googleads/swift-package-manager-google-mobile-ads.git", from: "12.12.0"),
         .package(url: "https://github.com/googleads/swift-package-manager-google-user-messaging-platform.git", from: "3.0.0")
     ],
     targets: [