build: Update Java from 21 to 25 (#82)

Author: thorlauridsen

README.md

@@ -27,7 +27,7 @@ Once the system is running, navigate to http://localhost:8080/
 to view the Swagger documentation.
 
 ## Technology
-- [JDK21](https://openjdk.org/projects/jdk/21/) - Latest JDK with long-term support 
+- [JDK25](https://openjdk.org/projects/jdk/25/) - Latest JDK with long-term support
 - [Kotlin](https://github.com/JetBrains/kotlin) - Programming language with Java interoperability
 - [Gradle](https://github.com/gradle/gradle) - Used for compilation, building, testing and dependency management
 - [Spring WebFlux](https://docs.spring.io/spring-framework/reference/web/webflux.html) - For creating reactive REST APIs

build.gradle.kts

@@ -10,7 +10,7 @@ repositories {
 }
 
 kotlin {
-	jvmToolchain(21)
+	jvmToolchain(25)
 	compilerOptions {
 		freeCompilerArgs.addAll("-Xjsr305=strict")
 	}