deps: Bump express from 4.22.2 to 5.2.1

internal/documentation/docs/pages/extensibility/CustomServerMiddleware.md

@@ -1,6 +1,6 @@
 # Custom UI5 Server Middleware
 
-The UI5 Server Extensibility enables you to enhance the functionality of the UI5 Server. You may want to handle requests differently. For example add various headers to a response or parse data of a POST request in a specific way. For this you can plug custom middleware implementations into the internal [express](https://expressjs.com/) server of the UI5 Server module.
+The UI5 Server Extensibility enables you to enhance the functionality of the UI5 Server. You may want to handle requests differently. For example add various headers to a response or parse data of a POST request in a specific way. For this you can plug custom middleware implementations into the internal [Express 5](https://expressjs.com/) server of the UI5 Server module.
 
 The UI5 community already created many custom middleware packages which you can integrate into your project. They are often prefixed by `ui5-middleware-` to make them easily searchable in the [npm registry](https://www.npmjs.com/search?q=ui5-middleware-).
 
@@ -32,7 +32,7 @@ In the above example the middleware `compression` is already included as a stand
 
 There can be optional configuration parameters which are passed directly to the custom middleware implementation (see below).
 
-An optional mountPath for which the middleware function is invoked can be provided. It will be passed to the `app.use` call (see [express API reference](https://expressjs.com/en/4x/api.html#app.use)).
+An optional mountPath for which the middleware function is invoked can be provided. It will be passed to the `app.use` call (see [express API reference](https://expressjs.com/en/5x/api.html#app.use)).
 
 ### Execution order
 

internal/documentation/docs/updates/migrate-v5.md

@@ -29,6 +29,8 @@ Or update your global install via: `npm i --global @ui5/cli@next`
 
 - **@ui5/cli: Option `--experimental-css-variables` has been removed**
 
+- **@ui5/server: The internal Express server has been upgraded from Express 4 to Express 5**
+
 
 ## Node.js and npm Version Support
 
@@ -369,6 +371,14 @@ not run by default. The [`versionInfo`](../pages/Server.md#versioninfo) middlewa
 The [`versionInfo`](../pages/Server.md#versioninfo) middleware now runs before [`serveResources`](../pages/Server.md#serveresources) rather than after it. Both match a request for `/resources/sap-ui-version.json`, but only `versionInfo` produces that file. Serving it first terminates the request directly and avoids `serveResources` triggering an unnecessary build of all dependencies while trying to locate the missing resource.
 :::
 
+## Express 5 Upgrade
+
+The UI5 Server uses [Express](https://expressjs.com/) internally to serve your project. With UI5 CLI v5, this internal Express server has been upgraded from Express 4 to Express 5.
+
+The standard middleware shipped with UI5 CLI is unaffected by this change. **However, if your project uses [custom server middleware](../pages/extensibility/CustomServerMiddleware.md), it might rely on Express APIs that changed with Express 5** (for example, changes to route path matching, `req.query` parsing, or removed methods).
+
+Review your custom middleware against the [Express 5 migration guide](https://expressjs.com/en/guide/migrating-5/) and adjust it if necessary.
+
 ## Learn More
 
 - [Project: Type `component`](../pages/Project#component)