build(deps): bump ch.qos.logback:logback-core

Bumps [ch.qos.logback:logback-core](https://github.com/qos-ch/logback) from 1.2.13 to 1.3.16.
- [Release notes](https://github.com/qos-ch/logback/releases)
- [Commits](qos-ch/logback@v_1.2.13...v_1.3.16)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-core
  dependency-version: 1.3.16
  dependency-type: direct:production
...

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

Author: dependabot[bot]

java-showcase/gapic-showcase/pom.xml

@@ -18,7 +18,7 @@
 
   <properties>
     <gapic-showcase.version>0.36.2</gapic-showcase.version>
-    <slf4j1-logback.version>1.2.13</slf4j1-logback.version>
+    <slf4j1-logback.version>1.3.16</slf4j1-logback.version>
   </properties>
 
   <build>
@@ -250,7 +250,7 @@
         <dependency>
           <groupId>ch.qos.logback</groupId>
           <artifactId>logback-core</artifactId>
-          <version>1.5.16</version>
+          <version>1.3.16</version>
           <scope>test</scope>
         </dependency>
       </dependencies>
@@ -339,7 +339,7 @@
         <dependency>
           <groupId>ch.qos.logback</groupId>
           <artifactId>logback-core</artifactId>
-          <version>1.3.15</version>
+          <version>1.3.16</version>
           <scope>test</scope>
         </dependency>
       </dependencies>