Projekt auf Java 21 umgestellt

Dockerfile

@@ -11,7 +11,7 @@ COPY frontend/ ./
 RUN npm run build
 
 
-FROM maven:3.9.11-eclipse-temurin-17 AS backend-build
+FROM maven:3.9.11-eclipse-temurin-21 AS backend-build
 WORKDIR /build/backend
 
 COPY backend/pom.xml ./
@@ -22,7 +22,7 @@ COPY --from=frontend-build /build/frontend/dist ./src/main/resources/static
 RUN mvn -B -q -DskipTests package
 
 
-FROM eclipse-temurin:17-jre-alpine AS runtime
+FROM eclipse-temurin:21-jre-alpine AS runtime
 WORKDIR /app
 
 RUN addgroup -S spring && adduser -S spring -G spring