Bump JsRuntimeHost pin to include napi string-getter underflow fix

Update the JsRuntimeHost FetchContent GIT_TAG to JRH main HEAD
(272f6a9f), which fixes an integer underflow in the Chakra
napi_get_value_string_* zero-bufsize handling:
BabylonJS/JsRuntimeHost#197

This also pulls in the three other commits since the previous pin:
- BabylonJS/JsRuntimeHost#188 (native fetch() polyfill)
- BabylonJS/JsRuntimeHost#195 (UrlLib/XMLHttpRequest statusText)
- BabylonJS/JsRuntimeHost#181 (napi_create_dataview overflow fix)

Verified: Playground (D3D11, Debug) configures and builds clean against
the bumped dependency.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bkaradzic

CMakeLists.txt

@@ -54,7 +54,7 @@ FetchContent_Declare(ios-cmake
     EXCLUDE_FROM_ALL)
 FetchContent_Declare(JsRuntimeHost
     GIT_REPOSITORY https://github.com/BabylonJS/JsRuntimeHost.git
-    GIT_TAG c88625b6d61b55c4589f02408d03826e83199870)
+    GIT_TAG 272f6a9f3de78f7c4cd8a838ae9655c81fc4881a)
 FetchContent_Declare(libwebp
     GIT_REPOSITORY https://github.com/webmproject/libwebp.git
     GIT_TAG 57e324e2eb99be46df46d77b65705e34a7ae616c