Bump redis from 2.10.6 to 4.5.3 in /tools/onboarding-server#9

dependabot[bot] wants to merge 1 commit intomasterraiden-network/workshop:masterfrom

dependabot/pip/tools/onboarding-server/redis-4.5.3raiden-network/workshop:dependabot/pip/tools/onboarding-server/redis-4.5.3Copy head branch name to clipboard