fix: kinde-springboot/kinde-springboot-core/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-14423947

Author: snyk-bot

kinde-springboot/kinde-springboot-core/pom.xml

@@ -37,7 +37,7 @@
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-webflux</artifactId>
         <optional>true</optional>
-        <version>3.5.6</version>
+        <version>4.0.0</version>
       </dependency>
 
     <dependency>