GH-95375
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Validate extension JSON: Error: Field 'classes/AudioStreamPlayer/properties/playing': setter changed value in new API, from "_set_playing" to &"set_playing".
Validate extension JSON: Error: Field 'classes/AudioStreamPlayer2D/properties/playing': setter changed value in new API, from "_set_playing" to &"set_playing".
Validate extension JSON: Error: Field 'classes/AudioStreamPlayer3D/properties/playing': setter changed value in new API, from "_set_playing" to &"set_playing".

These setters have been renamed to expose them. GDExtension language bindings couldn't have exposed these properties before.
