Bump xtend-maven-plugin from 2.25.0 to 2.28.0 in /ddk-parent#24

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dependabot/maven/ddk-parent/org.eclipse.xtend-xtend-maven-plugin-2.28.0markdomeng/dsl-devkit:dependabot/maven/ddk-parent/org.eclipse.xtend-xtend-maven-plugin-2.28.0Copy head branch name to clipboard