Update dependency de.codecentric:spring-boot-admin-server-ui to v3

Author: renovate[bot]

spring-boot-admin/pom.xml

@@ -13,7 +13,7 @@
 	</parent>
 
 	<properties>
-		<spring-boot-admin.version>2.7.14</spring-boot-admin.version>
+		<spring-boot-admin.version>3.1.8</spring-boot-admin.version>
 	</properties>
 
 	<dependencies>