fix(loaders): vendor decodeText for r165 deprecation

[CodyJasonBennett]

Vendors LoaderUtils.decodeText with the deprecation of https://github.com/mrdoob/three.js/pull/28278.

We use this over TextDecoder to play nice with Node, react-native, and edge environments where browser APIs are limited.

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:tada: This PR is included in version 2.30.3 :tada:

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