Bump logback-classic in /integration_tests/agent_smoke_test (#617)

Bumps logback-classic from 1.1.7 to 1.2.0.

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

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integration_tests/agent_smoke_test/pom.xml

@@ -35,7 +35,7 @@
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.1.7</version>
+      <version>1.2.0</version>
     </dependency>
   </dependencies>