add protected field and method,so can easy extends the PropertiesPropertySourceLoader class to custom default encoding,for example UTF-8

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Comment From: pivotal-cla

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Comment From: pivotal-cla

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Comment From: wilkinsona

Thanks for the proposal. Unfortunately, we need to complete the design work that is being tracked by https://github.com/spring-projects/spring-boot/issues/28663 before we can consider any changes in this area.