Update event source to use AnyURLSession

Package.resolved

@@ -0,0 +1,14 @@
+{
+  "pins" : [
+    {
+      "identity" : "anyurlsession",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/thebrowsercompany/AnyURLSession",
+      "state" : {
+        "branch" : "71f2424",
+        "revision" : "71f2424744cc3d12815e35d7ec2475e3456b4a9f"
+      }
+    }
+  ],
+  "version" : 2
+}

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.0
+// swift-tools-version:5.6
 
 import PackageDescription
 
@@ -13,10 +13,15 @@ let package = Package(
     products: [
         .library(name: "LDSwiftEventSource", targets: ["LDSwiftEventSource"]),
     ],
-    dependencies: [],
+    dependencies: [
+        .package(url: "https://github.com/thebrowsercompany/AnyURLSession", revision: "71f2424")
+    ],
     targets: [
         .target(
             name: "LDSwiftEventSource",
+            dependencies: [
+                .product(name: "AnyURLSession", package: "AnyURLSession")
+            ],
             path: "Source"),
         .testTarget(
             name: "LDSwiftEventSourceTests",

Source/LDSwiftEventSource.swift

@@ -1,7 +1,12 @@
 import Foundation
 
 #if os(Linux) || os(Windows)
-import FoundationNetworking
+import AnyURLSession
+
+import class FoundationNetworking.HTTPURLResponse
+import struct FoundationNetworking.URLRequest
+import class FoundationNetworking.URLResponse
+import class FoundationNetworking.URLSessionConfiguration
 #endif
 
 /**