fix(deps): update dependency org.springframework.boot:spring-boot-starter-parent to v4

Author: renovate[bot]

pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.8</version>
+        <version>4.0.0</version>
     </parent>
 
     <groupId>no.spk.felles</groupId>