Bumps ch.qos.logback:logback-classic from 1.5.18 to 1.5.20.

• 930fb15 prepare release 1.5.20
• 0b4432a provide an alternative to Janino based conditional configuration processing -...
• 258558f provide an alternative to Janino based conditional configuration processing -...
• ee77a70 provide an alternative to Janino based conditional configuration processing -...
• 5ca7ce8 provide an alternative to Janino based conditional configuration processing -...
• 728803f fix typo
• aa5eeb1 start work on version 1.5.20-SNAPSHOT
• e572d4f skip deployment of blackbox and example modules, published as version 1.5.9
• 4adae8b add plugin for Maven Central deployment
• ee70cf4 prepare release 1.5.19
• Additional commits viewable in compare view