Bump ch.qos.logback:logback-classic in /com.examples.school

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.2.3 to 1.2.13.
- [Commits](qos-ch/logback@v_1.2.3...v_1.2.13)

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

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

com.examples.school/pom.xml

@@ -30,7 +30,7 @@
       <!-- required to see Mongo Java Driver logs -->
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.2.3</version>
+      <version>1.2.13</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>