fix(types): make all parameters in types required for `ExtractRequest…

…Body<T>`

Fixes #528

scripts/update-endpoints/templates/endpoints.ts.template

@@ -35,7 +35,7 @@ type ExtractRequestBody<T> = "requestBody" extends keyof T
         }[keyof T["requestBody"]];
       }
   : {};
-type ToOctokitParameters<T> = ExtractParameters<T> & ExtractRequestBody<T>;
+type ToOctokitParameters<T> = ExtractParameters<T> & ExtractRequestBody<Required<T>>;
 
 type RequiredPreview<T> = T extends string
   ? {