Bump gson from 2.8.6 to 2.8.9 in /guides-parent#55

dependabot[bot] wants to merge 1 commit intomasternivelle/java-all:masterfrom

dependabot/maven/guides-parent/com.google.code.gson-gson-2.8.9nivelle/java-all:dependabot/maven/guides-parent/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard