fix: update response code

Updated the response code for login failures from 403 Frobidden to 401 UnAuthorized to more accurately reflect the correct HTTP status code for authentication failures.

Author: YunByungil

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/configuration/SpringDocSecurityConfiguration.java

@@ -147,7 +147,7 @@ OpenApiCustomizer springSecurityLoginEndpointCustomiser(ApplicationContext appli
 						operation.requestBody(requestBody);
 						ApiResponses apiResponses = new ApiResponses();
 						apiResponses.addApiResponse(String.valueOf(HttpStatus.OK.value()), new ApiResponse().description(HttpStatus.OK.getReasonPhrase()));
-						apiResponses.addApiResponse(String.valueOf(HttpStatus.UNAUTHORIZED.value()), new ApiResponse().description(HttpStatus.FORBIDDEN.getReasonPhrase()));
+						apiResponses.addApiResponse(String.valueOf(HttpStatus.UNAUTHORIZED.value()), new ApiResponse().description(HttpStatus.UNAUTHORIZED.getReasonPhrase()));
 						operation.responses(apiResponses);
 						operation.addTagsItem("login-endpoint");
 						PathItem pathItem = new PathItem().post(operation);