If you split the audio at the start and end of that last note then grab the right edge and ALT-DRAG, it will time-stretch the audio without changing the pitch.
If it's a held note, you might get a better result that with time-stretching if you can isolate a steady section in the middle of the sung note that you can copy/paste/insert a few times into the middle of the note with crossfades. Sort of like extending the sustain portion of the note...
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