Upgrade: bump gson from 2.8.6 to 2.8.9 in /javaee_ajax#1

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dependabot/maven/javaee_ajax/com.google.code.gson-gson-2.8.9yyaddaden/web-dev-courses-source-codes:dependabot/maven/javaee_ajax/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard