Update dependency org.springframework.boot:spring-boot-starter-parent to v3.5.6 (#203)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.5</version>
+        <version>3.5.6</version>
     </parent>
     <groupId>pl.piomin.services</groupId>
     <artifactId>sample-spring-kotlin-microservice</artifactId>