fix(deps): update spring.version to v6 [security]

Author: renovate[bot]

pom.xml

@@ -23,7 +23,7 @@
     <properties>
         <service.name>ConfigService-Dashboard</service.name>
         <jersey.version>2.48</jersey.version>
-        <spring.version>5.3.39</spring.version>
+        <spring.version>6.0.0</spring.version>
         <jetty.version>9.4.58.v20250814</jetty.version>
         <aws.version>1.12.797</aws.version>
         <slf4j.version>2.0.17</slf4j.version>