Bump spring-expression from 5.1.5.RELEASE to 5.2.21.RELEASE in /myspringBook#138

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dependabot/maven/myspringBook/org.springframework-spring-expression-5.2.21.RELEASEhuifer/javaBook-src:dependabot/maven/myspringBook/org.springframework-spring-expression-5.2.21.RELEASECopy head branch name to clipboard