Bump logback-classic in /tensorflow-keras-import-examples

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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Author: dependabot[bot]

tensorflow-keras-import-examples/pom.xml

@@ -37,7 +37,7 @@
         <maven.minimum.version>3.3.1</maven.minimum.version>
         <exec-maven-plugin.version>1.4.0</exec-maven-plugin.version>
         <maven-shade-plugin.version>2.4.3</maven-shade-plugin.version>
-        <logback.version>1.1.7</logback.version>
+        <logback.version>1.2.0</logback.version>
         <javacpp.version>1.5.5</javacpp.version>
         <tensorflow.version>1.15.5</tensorflow.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>