Bump follow-redirects, @slack/web-api and @slack/webhook#49

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mastertravisghansen/node-red-slack:masterfrom

dependabot/npm_and_yarn/follow-redirects-and-slack/web-api-and-slack/webhook-1.15.6travisghansen/node-red-slack:dependabot/npm_and_yarn/follow-redirects-and-slack/web-api-and-slack/webhook-1.15.6Copy head branch name to clipboard