Bump gson from 1.4 to 2.8.9 in /BackEnd/Server#11

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dependabot/maven/BackEnd/Server/com.google.code.gson-gson-2.8.9mobile-cloud-computing/HybridComputationalOffloading:dependabot/maven/BackEnd/Server/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard