Fix typo

secret-archive-service/src/main/java/cz/fi/muni/pa165/seminar4/group7/AgentAssignmentServiceImpl.java

@@ -75,7 +75,7 @@ public class AgentAssignmentServiceImpl implements AgentAssignmentService {
     public List<AgentAssignment> getAssignmentsByAgentId(String id) {
         var agent = agentDao.findById(id);
         if (agent.isEmpty()) {
-            throw new IllegalArgumentException(String.format("Agent with id %s does not exist.}", id));
+            throw new IllegalArgumentException(String.format("Agent with id %s does not exist.", id));
         }
         return agent.get().getAgentAssignments();
     }