Bump elasticsearch-rest-client from 6.4.3 to 6.8.15 in /spring-boot-project/spring-boot-dependencies#39

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dependabot/maven/spring-boot-project/spring-boot-dependencies/org.elasticsearch.client-elasticsearch-rest-client-6.8.15MrSorrow/spring-boot:dependabot/maven/spring-boot-project/spring-boot-dependencies/org.elasticsearch.client-elasticsearch-rest-client-6.8.15Copy head branch name to clipboard