restore deps

Author: JoeWang1127

java-showcase/gapic-showcase/pom.xml

@@ -281,7 +281,7 @@
         <dependency>
           <groupId>ch.qos.logback</groupId>
           <artifactId>logback-classic</artifactId>
-          <version>1.3.15</version>
+          <version>1.2.13</version>
           <scope>test</scope>
         </dependency>
         <dependency>