[openui5] Type regression: Menu$ItemSelectedEventParameters.item changed from MenuItem to IMenuItem #73952

🐞 Issue Description

Since version 1.138 (DefinitelyTyped PR #73225
), the sap.m interface Menu$ItemSelectedEventParameters defines the property item with the type IMenuItem.
Before this PR, the property had the type sap.m.MenuItem.

As a result, when accessing the "item" event parameter in a handler, previous method calls (e.g., getBindingContext) no longer work.

💥 Example

public onDateEndCalculateMenuButtonItemSelected(event: Menu$ItemSelectedEvent): void {
    const bindingContext = event.getParameter("item")?.getBindingContext("dialog");
}

TypeScript output:

error TS2339: Property 'getBindingContext' does not exist on type 'IMenuItem'.

📋 Details

This issue occurs everywhere the IMenuItem interface is used instead of sap.m.MenuItem.
The IMenuItem interface currently only contains one property:

__implements__sap_m_IMenuItem

💡 Expected Behavior

The item event parameter should provide access to the same methods as before (e.g., getBindingContext), or IMenuItem should properly reflect the type definition of sap.m.MenuItem.

✅ Environment

Type Definitions: since @types/openui5 version 1.138

UI5 Library: sap.m

TypeScript: 5.9.2