Bump spring-boot-starter-parent from 2.6.1 to 2.6.6 in /delay-callback-server#43

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dependabot/maven/delay-callback-server/org.springframework.boot-spring-boot-starter-parent-2.6.6joooohnli/delay-callback:dependabot/maven/delay-callback-server/org.springframework.boot-spring-boot-starter-parent-2.6.6Copy head branch name to clipboard