Remove UtterancePair class, use SpeechSynthesisUtterancePair class instead, see https://github.com/phetsims/utterance-queue/issues/43
Remove UtterancePair class, use SpeechSynthesisUtterancePair class instead, see https://github.com/phetsims/utterance-queue/issues/43

phetsims/scenery,phetsims/scenery,phetsims/scenery