types: Fix TreeData type

This fixes the following error when trying to use elementui with typescript 4.5:

  error TS2344: Type 'D' does not satisfy the constraint 'TreeData'

Closes #22401

types/element-ui.d.ts

@@ -316,7 +316,7 @@ export class Tooltip extends ElTooltip {}
 export class Transfer extends ElTransfer {}
 
 /** Tree Component */
-export class Tree<K = any, D = TreeData> extends ElTree<K, D> {}
+export class Tree<K = any, D extends TreeData = TreeData> extends ElTree<K, D> {}
 
 /** Upload Component */
 export class Upload extends ElUpload {}