Bump spring.version from 4.3.17.RELEASE to 5.2.1.RELEASE in /mybatis-learn#3

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dependabot/maven/mybatis-learn/spring.version-5.2.1.RELEASEqiurunze123/threadandjuc:dependabot/maven/mybatis-learn/spring.version-5.2.1.RELEASECopy head branch name to clipboard