Update dependency org.springframework.boot:spring-boot-starter-parent to v3.5.6

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>
     <relativePath /> <!-- lookup parent from repository -->
   </parent>