Bump gson from 2.8.6 to 2.8.9 in /walkthroughs/week-4-tdd/project#9

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dependabot/maven/walkthroughs/week-4-tdd/project/com.google.code.gson-gson-2.8.9shradha-khapra/software-product-sprint-2020:dependabot/maven/walkthroughs/week-4-tdd/project/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard