Bump logback-core from 1.0.6 to 1.2.0 in /demo-gwt#9

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dependabot/maven/demo-gwt/ch.qos.logback-logback-core-1.2.0nmorel/flatpack-java:dependabot/maven/demo-gwt/ch.qos.logback-logback-core-1.2.0Copy head branch name to clipboard