Hide a couple of warnings

src/activities/Elsa.Activities.Http/Activities/Redirect/Redirect.cs

@@ -39,7 +39,7 @@ namespace Elsa.Activities.Http
             var response = _httpContextAccessor.HttpContext.Response;
 
             if (response.HasStarted)
-                return Fault(T["Response has already started"]);
+                return Fault(T["Response has already started"]!);
             
             return new RedirectResult(_httpContextAccessor, Location, Permanent);
         }

src/core/Elsa.Abstractions/Services/Models/SaveWorkflowContext.cs

@@ -10,7 +10,7 @@ namespace Elsa.Services.Models
         }
 
         public WorkflowExecutionContext WorkflowExecutionContext { get; }
-        public Type ContextType => WorkflowExecutionContext.WorkflowBlueprint.ContextOptions!.ContextType;
+        public Type ContextType => WorkflowExecutionContext.WorkflowBlueprint.ContextOptions!.ContextType!;
         public string ContextId => WorkflowExecutionContext.WorkflowInstance.ContextId!;
         public object Context => WorkflowExecutionContext.WorkflowContext!; 
     }

src/core/Elsa.Core/Services/WorkflowBlueprintMaterializer.cs

@@ -78,7 +78,7 @@ namespace Elsa.Services
                         continue;
                     }
 
-                    var provider = new ExpressionActivityPropertyValueProvider(property.Expression, property.Syntax, prop.PropertyType);
+                    var provider = new ExpressionActivityPropertyValueProvider(property.Expression!, property.Syntax!, prop.PropertyType);
                     propertyProviders.AddProvider(activityDefinition.ActivityId, property.Name, provider);
                 }
             }

src/dashboards/blazor/ElsaDashboard.Application/Options/ElsaDashboardOptions.cs

@@ -4,6 +4,6 @@ namespace ElsaDashboard.Application.Options
 {
     public class ElsaDashboardOptions
     {
-        public Uri ElsaServerUrl { get; set; }
+        public Uri ElsaServerUrl { get; set; } = default!;
     }
 }