Bump spring-boot-starter-parent from 2.5.4 to 2.5.7 in /mock-server#23

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dependabot/maven/mock-server/org.springframework.boot-spring-boot-starter-parent-2.5.7sarbesh/mock-server:dependabot/maven/mock-server/org.springframework.boot-spring-boot-starter-parent-2.5.7Copy head branch name to clipboard