[Snyk] Security upgrade @slack/webhook from 5.0.4 to 7.0.0#50

dcarroll wants to merge 2 commits intomasterdcarroll/alerter:masterfrom

snyk-fix-300a3757dd60ebe0600e7b21ae700cf9dcarroll/alerter:snyk-fix-300a3757dd60ebe0600e7b21ae700cf9Copy head branch name to clipboard