Native: bump PROTOCOL_VERSION to 10 for cube render target API

Addresses review: cube RT adds isCube/layer params that old native silently ignores (2D RT with aliased faces, no error). Bumping the protocol version makes any JS<->Native version skew fail loudly at engine init via the existing strict-equality check, instead of rendering incorrectly. Pairs with the native-side bump in BabylonJS/BabylonNative#1750 (landed together with the babylonjs pin bump).

Author: bkaradzic-microsoft

packages/dev/core/src/Engines/thinNativeEngine.pure.ts

@@ -211,7 +211,7 @@ const remappedAttributesNames: string[] = [];
 /** @internal */
 export class ThinNativeEngine extends ThinEngine {
     // This must match the protocol version in NativeEngine.cpp
-    private static readonly PROTOCOL_VERSION = 9;
+    private static readonly PROTOCOL_VERSION = 10;
 
     /** @internal */
     public static _createNativeDataStream(): NativeDataStream {