Bump ch.qos.logback:logback-classic from 1.4.5 to 1.4.12 in /core (#306)

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.4.5 to 1.4.12.
- [Commits](qos-ch/logback@v_1.4.5...v_1.4.12)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-type: direct:development
...

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Author: dependabot[bot]

core/pom.xml

@@ -78,7 +78,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.4.5</version>
+            <version>1.4.12</version>
             <scope>test</scope>
         </dependency>
         <dependency>