fix: enable sha256 and sha512 for git ssh (cherry-pick of #18028)#18031

jannfis merged 1 commit intoargoproj:release-2.8argoproj/argo-cd:release-2.8from

jannfis:fix/2_8-ssh_known_hostsjannfis/argo-cd:fix/2_8-ssh_known_hostsCopy head branch name to clipboard