Bump xstream from 1.4.8 to 1.4.15 in /Pitest-1.5.2/pitest#1

dependabot[bot] wants to merge 1 commit intomastersynchi/master-project-mutation-testing:masterfrom

dependabot/maven/Pitest-1.5.2/pitest/com.thoughtworks.xstream-xstream-1.4.15synchi/master-project-mutation-testing:dependabot/maven/Pitest-1.5.2/pitest/com.thoughtworks.xstream-xstream-1.4.15Copy head branch name to clipboard