fix: change when result cache gets emptied

There are many methods on QuerySet that implicitly call
fetch_all. This moves emptying the result cache to immediately
before the explicit call to fetch_call after the page number has
been updated. This ensures that the correct latest page is fetched.

tableauserverclient/server/query.py

@@ -47,10 +47,10 @@ def __iter__(self: Self) -> Iterator[T]:
 
         for page in count(1):
             self.request_options.pagenumber = page
+            self._result_cache = []
             self._fetch_all()
             yield from self._result_cache
             # Set result_cache to empty so the fetch will populate
-            self._result_cache = []
             if (page * self.page_size) >= len(self):
                 return