Bump johnzon-mapper from 1.2.3 to 1.2.21 in /modules/multi-timer-app#1

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dependabot/maven/modules/multi-timer-app/org.apache.johnzon-johnzon-mapper-1.2.21demonfiddler/multi-timer:dependabot/maven/modules/multi-timer-app/org.apache.johnzon-johnzon-mapper-1.2.21Copy head branch name to clipboard