Update plugin org.springframework.boot to v4.1.1

Author: renovate[bot]

Server/build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'java'
-    id 'org.springframework.boot' version '4.0.2'
+    id 'org.springframework.boot' version '4.1.1'
     id 'io.spring.dependency-management' version '1.1.7'
     id 'org.springdoc.openapi-gradle-plugin' version '1.9.0'
 }