fix(pipewire): prevent bursty real-time promotion - #1292
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A user on Discord reported getting 'Failed to promote audio thread to real-time priority: AudioThreadPriorityError: Thread promotion error ("Device or resource busy"): "Device or resource bus"' errors, noticing his quantum size changed on every callback.
This PR fixes that by using a growth-only strategy when the quantum size is jittery (e.g. for non-integer resampling ratios, or to compensate for clock drift, ...)