fix(deps): update spring boot to v3.5.6

Author: renovate[bot]

pom.xml

@@ -14,7 +14,7 @@
         <maven.compiler.target>${java.version}</maven.compiler.target>
         <maven.compiler.release>${java.version}</maven.compiler.release>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <spring.boot.version>3.5.4</spring.boot.version>
+        <spring.boot.version>3.5.6</spring.boot.version>
         <spring.cloud.version>2025.0.0</spring.cloud.version>
         <logstash.encoder>8.1</logstash.encoder>
         <apache.commons.collections4>4.5.0</apache.commons.collections4>