Bump approvaltests from 9.3.0 to 15.3.0#135

dependabot[bot] wants to merge 1 commit intomasterLearnWithLlew/DuplicationKata.java:masterfrom

dependabot/maven/com.approvaltests-approvaltests-15.3.0LearnWithLlew/DuplicationKata.java:dependabot/maven/com.approvaltests-approvaltests-15.3.0Copy head branch name to clipboard