Bump gson from 2.2.2 to 2.8.9 in /highcharts/exporting-server/java/highcharts-export/highcharts-export-convert#16

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dependabot/maven/highcharts/exporting-server/java/highcharts-export/highcharts-export-convert/com.google.code.gson-gson-2.8.9instedd/ests:dependabot/maven/highcharts/exporting-server/java/highcharts-export/highcharts-export-convert/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard