Bump xstream from 1.4.9 to 1.4.15 in /spring-boot-redis-demo#8

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dependabot/maven/spring-boot-redis-demo/com.thoughtworks.xstream-xstream-1.4.15wenfengSAT/wenfengSAT-SpringBoot:dependabot/maven/spring-boot-redis-demo/com.thoughtworks.xstream-xstream-1.4.15Copy head branch name to clipboard