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
...

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

Author: dependabot[bot]

tensorflow-keras-import-examples/pom.xml

@@ -39,7 +39,7 @@
         <maven-shade-plugin.version>2.4.3</maven-shade-plugin.version>
         <jcommon.version>1.0.23</jcommon.version>
         <jfreechart.version>1.0.13</jfreechart.version>
-        <logback.version>1.1.7</logback.version>
+        <logback.version>1.2.0</logback.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>