UniformUtils: Fix deep-copy with array of uniforms.

[Mugen87]

Fixed #16080.

Description

Makes sure the deep-copy in UniformUtils works when arrays of THREE objects (e.g. colors, vectors, matrices) as uniforms are in place.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	361.21 85.78	361.21 85.78	+0 B +0 B
WebGPU	637.48 177.06	637.48 177.06	+0 B +0 B
WebGPU Nodes	635.59 176.76	635.59 176.76	+0 B +0 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	493.58 120.42	493.71 120.45	+132 B +31 B
WebGPU	709.22 191.88	709.22 191.88	+0 B +0 B
WebGPU Nodes	658.44 179.17	658.44 179.17	+0 B +0 B