fix: replace pickle with json for audio feature cache (RCE prevention)#4059

BossChaos wants to merge 2 commits intoScottcjn:mainScottcjn/Rustchain:mainfrom

BossChaos:fix/replace-pickle-with-json-boot-chimeBossChaos/Rustchain:fix/replace-pickle-with-json-boot-chimeCopy head branch name to clipboard