Bump gson from 2.8.0 to 2.8.9 in /mio-project#17

dependabot[bot] wants to merge 1 commit intomasterMiofly/Java:masterfrom

dependabot/maven/mio-project/com.google.code.gson-gson-2.8.9Miofly/Java:dependabot/maven/mio-project/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard