Bump spring-core from 3.1.1.RELEASE to 4.3.21.RELEASE in /manager_arpg#22

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dependabot/maven/manager_arpg/org.springframework-spring-core-4.3.21.RELEASEa1422020484/JavaSocketLearn:dependabot/maven/manager_arpg/org.springframework-spring-core-4.3.21.RELEASECopy head branch name to clipboard