Merge pull request #92 from fumito-ito/renovate/firebase-firebase-ios-sdk-11.x

Update dependency firebase/firebase-ios-sdk to from: "11.15.0"

Author: fumito-ito

Package.swift

@@ -21,7 +21,7 @@ let package = Package(
     dependencies: [
         .package(
             url: "https://github.com/firebase/firebase-ios-sdk.git",
-            .upToNextMajor(from: "11.14.0")
+            .upToNextMajor(from: "11.15.0")
         ),
     ],
     targets: [