WebGPUTextureUtils: Add missing rgba8unorm-srgb to _getTypedArrayType().

[Mugen87]

Fixed #31654

Description

Adds the missing rgba8unorm-srgb texture format to _getTypedArrayType().

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.9 79.1	338.9 79.1	+0 B +0 B
WebGPU	575.21 158.73	575.22 158.73	+8 B +2 B
WebGPU Nodes	573.82 158.49	573.83 158.49	+8 B +1 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	470.64 113.87	470.64 113.87	+0 B +0 B
WebGPU	646.28 174.8	646.29 174.8	+8 B +1 B
WebGPU Nodes	600.46 163.98	600.47 163.98	+8 B +1 B