build: Update Java from 21 to 25 (#85)

Author: thorlauridsen

README.md

@@ -28,7 +28,7 @@ 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
 - [Gradle](https://github.com/gradle/gradle) - Used for compilation, building, testing and dependency management
 - [Spring Boot Web MVC](https://github.com/spring-projects/spring-boot) - For creating REST APIs
 - [Springdoc](https://github.com/springdoc/springdoc-openapi) - Provides Swagger documentation for REST APIs

build.gradle.kts

@@ -7,7 +7,7 @@ version = "0.0.1-SNAPSHOT"
 
 java {
 	toolchain {
-		languageVersion = JavaLanguageVersion.of(21)
+		languageVersion = JavaLanguageVersion.of(25)
 	}
 }