Bump gson from 2.8.6 to 2.8.9 in /exonum-java-binding#1744

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dependabot/maven/exonum-java-binding/com.google.code.gson-gson-2.8.9exonum/exonum-java-binding:dependabot/maven/exonum-java-binding/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard