Bump spring-webmvc from 4.3.7.RELEASE to 5.2.20.RELEASE in /mio-parent#31

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dependabot/maven/mio-parent/org.springframework-spring-webmvc-5.2.20.RELEASEMiofly/Java:dependabot/maven/mio-parent/org.springframework-spring-webmvc-5.2.20.RELEASECopy head branch name to clipboard