Bump groovy from 2.3.8 to 2.4.21 in /spring-boot-dependencies#21

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dependabot/maven/spring-boot-dependencies/org.codehaus.groovy-groovy-2.4.21devilelephant/spring-boot:dependabot/maven/spring-boot-dependencies/org.codehaus.groovy-groovy-2.4.21Copy head branch name to clipboard