Bump gson from 2.8.1 to 2.8.9 in /mlserver-java-clients/ChatBotClient/java-client#57

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dependabot/maven/mlserver-java-clients/ChatBotClient/java-client/com.google.code.gson-gson-2.8.9microsoft/microsoft-r:dependabot/maven/mlserver-java-clients/ChatBotClient/java-client/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard