fix(pagination): handle out-of-bounds slicing in pagination

Ensure the pagination function correctly handles out-of-bounds indices  
when slicing items. Update the slice logic to prevent slice bounds  
errors and add a test case for better coverage of edge cases.

pagination.go

@@ -87,7 +87,7 @@ func GetPage[T any](items []T, first *int, after *string, last *int, before *str
 		sIx = f
 		eIx = idx
 	}
-	page := items[sIx:eIx]
+	page := items[sIx:min(eIx, len(items))]
 	return page, PageInfo{
 		StartCursor:     ptr(EncodeCursor(fn(page[0]))),
 		HasNextPage:     eIx < len(items),