Bump ch.qos.logback:logback-classic from 1.2.11 to 1.2.13

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.2.11 to 1.2.13.
- [Commits](qos-ch/logback@v_1.2.11...v_1.2.13)

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

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -149,7 +149,7 @@
       <dependency>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-classic</artifactId>
-        <version>1.2.11</version> <!-- All versions higher than 1.2.11 don't compile for jdk8 (not even 1.2.12 is working due to google-cloud-logging-logback) -->
+        <version>1.2.13</version> <!-- All versions higher than 1.2.13 don't compile for jdk8 (not even 1.2.12 is working due to google-cloud-logging-logback) -->
       </dependency>
       <dependency>
         <artifactId>junit</artifactId>