Avatar lighting issues

Fix avatar lighting issue

Description

An issue has been identified with certain avatars in the glTFRuntime plugin, wherein the head of the avatar appears dark. This issue is prevalent in the 20230225 and earlier versions of the plugin.

Resolution

The issue has been addressed in the latest master version of the glTFRuntime plugin. It is recommended that users encountering this issue upgrade to the latest master version of the plugin for a permanent resolution.