Update base for Update on "[ET-VK] Minor improvement to q_linear op s…

…hader."

This diff contains a minor improvement to the q_linear op shader in the Vulkan backend for Executorch. The code changes in the q_8w_linear.glsl file include a change in position parameter from a 3-element u16vec3 to a 2-element u16vec2.

Differential Revision: [D68113154](https://our.internmc.facebook.com/intern/diff/D68113154/)

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