Rename compatibleWithLiveObjectsProtocolV6 to compatibleWithProtocolV6

Follow the rename in ably-cocoa-plugin-support (ecbf903) and update
the pin.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: lawrence-forooghian

Package.resolved

@@ -21,12 +21,12 @@ let package = Package(
         // TODO: Unpin before release
         .package(
             url: "https://github.com/ably/ably-cocoa",
-            revision: "5b2684ab",
+            revision: "af5d05ad",
         ),
         // TODO: Unpin before release
         .package(
             url: "https://github.com/ably/ably-cocoa-plugin-support",
-            revision: "c1fe793",
+            revision: "c20f969",
         ),
         .package(
             url: "https://github.com/apple/swift-argument-parser",

Package.swift

@@ -9,7 +9,7 @@ import ObjectiveC.NSObject
 internal final class DefaultInternalPlugin: NSObject, _AblyPluginSupportPrivate.LiveObjectsInternalPluginProtocol {
     private let pluginAPI: _AblyPluginSupportPrivate.PluginAPIProtocol
 
-    internal var compatibleWithLiveObjectsProtocolV6: Bool { true }
+    internal var compatibleWithProtocolV6: Bool { true }
 
     internal init(pluginAPI: _AblyPluginSupportPrivate.PluginAPIProtocol) {
         precondition(