build(deps): bump ch.qos.logback:logback-classic from 1.2.12 to 1.3.12

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.2.12 to 1.3.12.
- [Commits](qos-ch/logback@v_1.2.12...v_1.3.12)

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

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

pom.xml

@@ -138,7 +138,7 @@
         <killbill-platform.version>0.41.3</killbill-platform.version>
         <killbill-plugin-api.version>0.27.0</killbill-plugin-api.version>
         <killbill-testing-mysql.version>1.0.2</killbill-testing-mysql.version>
-        <logback.version>1.2.12</logback.version>
+        <logback.version>1.3.12</logback.version>
         <metrics.version>4.2.12</metrics.version>
         <netty.version>4.1.84.Final</netty.version>
         <org.osgi.core.version>6.0.0</org.osgi.core.version>