OZG-4612 remove unused spring security beans

alfa-service/src/main/java/de/ozgcloud/alfa/SecurityConfiguration.java

@@ -29,8 +29,6 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.HttpMethod;
-import org.springframework.security.authentication.AuthenticationManager;
-import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
 import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
@@ -38,8 +36,6 @@ import org.springframework.security.config.annotation.web.configurers.oauth2.ser
 import org.springframework.security.config.http.SessionCreationPolicy;
 import org.springframework.security.web.SecurityFilterChain;
 import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
-import org.springframework.security.web.authentication.session.NullAuthenticatedSessionStrategy;
-import org.springframework.security.web.authentication.session.SessionAuthenticationStrategy;
 import org.springframework.security.web.csrf.CookieCsrfTokenRepository;
 import org.springframework.security.web.header.writers.frameoptions.XFrameOptionsHeaderWriter;
 import org.springframework.security.web.header.writers.frameoptions.XFrameOptionsHeaderWriter.XFrameOptionsMode;
@@ -90,13 +86,4 @@ public class SecurityConfiguration {
 		Optional.ofNullable(springJwtProperties.getJwkSetUri()).ifPresent(jwkSetUri -> configurer.jwt().jwkSetUri(jwkSetUri));
 	}
 
-	@Bean
-	protected SessionAuthenticationStrategy sessionAuthenticationStrategy() {
-		return new NullAuthenticatedSessionStrategy();
-	}
-
-	@Bean
-	AuthenticationManager authenticationManager(HttpSecurity http) throws Exception {
-		return http.getSharedObject(AuthenticationManagerBuilder.class).build();
-	}
 }