fix(deps): update spring core to v6

Author: renovate[bot]

pom.xml

@@ -53,7 +53,7 @@
         <ehcache-spring-annotations.version>1.2.0</ehcache-spring-annotations.version>
         <ehcache.version>2.10.4</ehcache.version>
         <portletUtils.version>1.1.3</portletUtils.version>
-        <spring.version>4.3.30.RELEASE</spring.version>
+        <spring.version>6.1.12</spring.version>
         <resource-server.version>1.0.42</resource-server.version>
         <uportal-libs.version>5.14.0</uportal-libs.version>
     </properties>