Bump logback-core from 1.2.0 to 1.2.9 in /ocpp-v1_6-test

Bumps logback-core from 1.2.0 to 1.2.9.

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-core
  dependency-type: direct:development
...

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Author: dependabot[bot]

ocpp-v1_6-test/pom.xml

@@ -77,7 +77,7 @@
 		<dependency>
 		    <groupId>ch.qos.logback</groupId>
 		    <artifactId>logback-core</artifactId>
-		    <version>1.2.0</version>
+		    <version>1.2.9</version>
             <scope>test</scope>
 		</dependency>
 		<dependency>