Bump fastjson from 1.2.78 to 2.0.20 in /delay-callback-server#79

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dependabot/maven/delay-callback-server/com.alibaba-fastjson-2.0.20joooohnli/delay-callback:dependabot/maven/delay-callback-server/com.alibaba-fastjson-2.0.20Copy head branch name to clipboard