fix(deps): update spring core to v6

Author: renovate[bot]

pom.xml

@@ -53,7 +53,7 @@
         <logbackVersion>1.4.4</logbackVersion>
         <resource-server.version>1.4.1</resource-server.version>
         <sl4jVersion>1.7.36</sl4jVersion>
-        <spring.version>4.3.30.RELEASE</spring.version>
+        <spring.version>6.0.2</spring.version>
         <uPortal.version>5.12.0</uPortal.version>
     </properties>