fix: playground/kinde-springboot-starter-example/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-CHQOSLOGBACK-13169722

Author: snyk-bot

playground/kinde-springboot-starter-example/pom.xml

@@ -73,7 +73,7 @@
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
       <scope>runtime</scope>
-      <version>1.5.18</version>
+      <version>1.5.19</version>
     </dependency>
 
     <dependency>