Bump xtend-maven-plugin from 2.25.0 to 2.26.0 in /ddk-parent#9

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dependabot/maven/ddk-parent/org.eclipse.xtend-xtend-maven-plugin-2.26.0markdomeng/dsl-devkit:dependabot/maven/ddk-parent/org.eclipse.xtend-xtend-maven-plugin-2.26.0Copy head branch name to clipboard