Bump ch.qos.logback:logback-classic from 1.2.11 to 1.5.6

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.2.11 to 1.5.6.
- [Commits](qos-ch/logback@v_1.2.11...v_1.5.6)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -23,7 +23,7 @@
   <properties>
     <mavenVersion>3.8.7</mavenVersion>
     <slf4jVersion>1.7.36</slf4jVersion>
-    <logbackVersion>1.2.11</logbackVersion>
+    <logbackVersion>1.5.6</logbackVersion>
     <pluginTestingVersion>3.0.2</pluginTestingVersion>
 
     <takari.javaSourceVersion>1.8</takari.javaSourceVersion>