Updated minimum platform versions to match firebase sdk

Author: rickpasveer

Package.swift

@@ -1,15 +1,15 @@
-// swift-tools-version:5.3
+// swift-tools-version:6.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
     name: "SegmentFirebase",
     platforms: [
-        .macOS("10.15"),
-        .iOS("13.0"),
-        .tvOS("13.0"),
-        .watchOS("7.1")
+        .macOS(.v10_15),
+        .iOS(.v15),
+        .tvOS(.v15),
+        .watchOS(.v7)
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.