Add docs from gofiber/fiber@6d16bf5

Author: github-actions[bot]

docs/core/middleware/basicauth.md

@@ -6,7 +6,7 @@ id: basicauth
 
 Basic Authentication middleware for [Fiber](https://github.com/gofiber/fiber) that provides an HTTP basic authentication. It calls the next handler for valid credentials and [401 Unauthorized](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/401) or a custom response for missing or invalid credentials.
 
-The default unauthorized response includes the header `WWW-Authenticate: Basic realm="Restricted"`.
+The default unauthorized response includes the header `WWW-Authenticate: Basic realm="Restricted", charset="UTF-8"` and sets `Cache-Control: no-store`.
 
 ## Signatures
 
@@ -78,6 +78,8 @@ func handler(c fiber.Ctx) error {
 | Next            | `func(fiber.Ctx) bool`     | Next defines a function to skip this middleware when returned true.                                                                                                   | `nil`                 |
 | Users           | `map[string]string`         | Users defines the allowed credentials.                                                                                                                                | `map[string]string{}` |
 | Realm           | `string`                    | Realm is a string to define the realm attribute of BasicAuth. The realm identifies the system to authenticate against and can be used by clients to save credentials. | `"Restricted"`        |
+| Charset         | `string`                    | Charset sent in the `WWW-Authenticate` header, so clients know how credentials are encoded. | `"UTF-8"` |
+| StorePassword   | `bool`                      | Store the plaintext password in the context and retrieve it via `PasswordFromContext`. | `false` |
 | Authorizer      | `func(string, string) bool` | Authorizer defines a function to check the credentials. It will be called with a username and password and is expected to return true or false to indicate approval.  | `nil`                 |
 | Unauthorized    | `fiber.Handler`             | Unauthorized defines the response body for unauthorized responses.                                                                                                    | `nil`                 |
 
@@ -88,6 +90,8 @@ var ConfigDefault = Config{
     Next:            nil,
     Users:           map[string]string{},
     Realm:           "Restricted",
+    Charset:         "UTF-8",
+    StorePassword:   false,
     Authorizer:      nil,
     Unauthorized:    nil,
 }

docs/core/whats_new.md

@@ -975,7 +975,7 @@ The adaptor middleware has been significantly optimized for performance and effi
 
 ### BasicAuth
 
-The BasicAuth middleware was updated for improved robustness in parsing the Authorization header, with enhanced validation and whitespace handling. The default unauthorized response now uses a properly quoted and capitalized `WWW-Authenticate` header.
+The BasicAuth middleware now validates the `Authorization` header more rigorously and sets security-focused response headers. The default challenge includes the `charset="UTF-8"` parameter and disables caching. Passwords are no longer stored in the request context by default; use the new `StorePassword` option to retain them. A `Charset` option controls the value used in the challenge header.
 
 ### Cache