Update spring boot to v4

Author: renovate[bot]

pom.xml

@@ -41,7 +41,7 @@
         <logstash-logback.version>8.1</logstash-logback.version>
         <loki-logback.version>2.0.1</loki-logback.version>
         <spring.version>6.2.14</spring.version>
-        <spring.boot.version>3.5.8</spring.boot.version>
+        <spring.boot.version>4.0.0</spring.boot.version>
         <slf4j.version>2.0.17</slf4j.version>
         <sonar.projectKey>piomin_spring-boot-logging</sonar.projectKey>
         <sonar.organization>piomin</sonar.organization>