Bump spring-expression from 4.1.5.RELEASE to 5.2.21.RELEASE in /train#21

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dependabot/maven/train/org.springframework-spring-expression-5.2.21.RELEASEJasonMHo/train:dependabot/maven/train/org.springframework-spring-expression-5.2.21.RELEASECopy head branch name to clipboard