Bump gson from 2.6.2 to 2.8.9 in /iot-ruleengine#59

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dependabot/maven/iot-ruleengine/com.google.code.gson-gson-2.8.9osswangxining/iotplatform:dependabot/maven/iot-ruleengine/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard