Bump logback-core from 1.2.3 to 1.2.9 (#85)

Bumps logback-core from 1.2.3 to 1.2.9.

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

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Author: dependabot[bot]

pom.xml

@@ -235,7 +235,7 @@ limitations under the License.
         <guava.version>30.1.1-jre</guava.version>
         <javapoet.version>1.13.0</javapoet.version>
         <jmockit.version>1.49</jmockit.version>
-        <logback.version>1.2.3</logback.version>
+        <logback.version>1.2.9</logback.version>
         <metainf-services.version>1.8</metainf-services.version>
         <mockito.version>3.12.4</mockito.version>
         <slf4j.version>1.7.30</slf4j.version>