Inject plainRestTemplate into SubmitContactUseCaseImpl and update RestTemplateConfig.

backend/common/src/main/java/dev/rheinsw/shared/rest/RestTemplateConfig.java

@@ -1,5 +1,6 @@
 package dev.rheinsw.shared.rest;
 
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.cloud.client.loadbalancer.LoadBalanced;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -12,9 +13,9 @@ import org.springframework.web.client.RestTemplate;
 @Configuration
 public class RestTemplateConfig {
 
-    @LoadBalanced
     @Bean
-    public RestTemplate mailRestTemplate() {
+    public RestTemplate plainRestTemplate() {
         return new RestTemplate();
     }
+
 }