Bump spring-expression from 5.1.8.RELEASE to 5.2.21.RELEASE in /k2-parent#34

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dependabot/maven/k2-parent/org.springframework-spring-expression-5.2.21.RELEASEkatari/k2:dependabot/maven/k2-parent/org.springframework-spring-expression-5.2.21.RELEASECopy head branch name to clipboard