Bump spring-expression from 4.2.3.RELEASE to 5.2.21.RELEASE in /twitterwall-old#19

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dependabot/maven/twitterwall-old/org.springframework-spring-expression-5.2.21.RELEASESpring-Framework-Java-Apps/twitterwall:dependabot/maven/twitterwall-old/org.springframework-spring-expression-5.2.21.RELEASECopy head branch name to clipboard