fix: deduplicate concurrent signer credential refreshes - #842

fix: deduplicate concurrent signer credential refreshes#842

Xuanwo wants to merge 2 commits into

mainapache/opendal-reqsign:mainfrom

xuanwo/signer-refresh-singleflightapache/opendal-reqsign:xuanwo/signer-refresh-singleflightCopy head branch name to clipboard