Bump gson from 2.2.4 to 2.8.9 in /thucydides-core#196

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dependabot/maven/thucydides-core/com.google.code.gson-gson-2.8.9thucydides-webtests/thucydides:dependabot/maven/thucydides-core/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard