[ci] Replace mimalloc with snmalloc #2168

Job	Run time
Template generation (score-avnd-simple-template)	14s
Template generation (score-vfx-template)	18s
Template generation (score-process-template)	15s
Template generation (score-device-template)	16s
Template generation (score-offline-process-template)	16s
score-vfx-template (Windows)	6m 58s
score-process-template (Windows)	7m 13s
score-device-template (Windows)	7m 24s
score-avnd-simple-template (Windows)	10m 12s
score-offline-process-template (Windows)	7m 58s
score-vfx-template (Ubuntu)	4m 35s
score-process-template (Ubuntu)	4m 57s
score-device-template (Ubuntu)	4m 11s
score-avnd-simple-template (Ubuntu)	4m 1s
score-offline-process-template (Ubuntu)	5m 0s
score-vfx-template (macOS)	4m 33s
score-process-template (macOS)	5m 18s
score-device-template (macOS)	5m 32s
score-avnd-simple-template (macOS)	4m 54s
score-offline-process-template (macOS)	4m 35s
	1h 28m 40s

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