Bump gson from 2.8.2 to 2.8.9 in /back-end/server/routes#21

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dependabot/maven/back-end/server/routes/com.google.code.gson-gson-2.8.9StetsonMathCS/monkeyseemonkey.news:dependabot/maven/back-end/server/routes/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard