Bump ch.qos.logback:logback-classic (#320)

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.3.11 to 1.3.12.
- [Commits](qos-ch/logback@v_1.3.11...v_1.3.12)

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

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Author: dependabot[bot]

examples/fabric-contract-example-maven/pom.xml

@@ -15,7 +15,7 @@
 		<fabric-chaincode-java.version>2.5.0</fabric-chaincode-java.version>
 
 		<!-- Logging -->
-		<logback.version>1.3.11</logback.version>
+		<logback.version>1.3.12</logback.version>
 		<slf4j.version>1.7.5</slf4j.version>
 
 		<!-- Test -->