Bump axios, @slack/web-api and @slack/webhook#28

dependabot[bot] wants to merge 1 commit intomasterbridge-school/comms-service:masterfrom

dependabot/npm_and_yarn/axios-and-slack/web-api-and-slack/webhook-0.21.4bridge-school/comms-service:dependabot/npm_and_yarn/axios-and-slack/web-api-and-slack/webhook-0.21.4Copy head branch name to clipboard