Bump tokio from 1.20.0 to 1.20.4#8

dependabot[bot] wants to merge 1 commit intomasterAbsaOSS/aries-oob-shortener:masterfrom

dependabot/cargo/tokio-1.20.4AbsaOSS/aries-oob-shortener:dependabot/cargo/tokio-1.20.4Copy head branch name to clipboard