patch 8.1.2162: popup resize test is flaky

Problem:    Popup resize test is flaky. (Christian Brabandt)
Solution:   Add the function to the list of flaky tests.

src/testdir/runtest.vim

@@ -340,6 +340,7 @@ let s:flaky_tests = [
       \ 'Test_quotestar()',
       \ 'Test_raw_one_time_callback()',
       \ 'Test_reltime()',
+      \ 'Test_popup_and_window_resize()',
       \ 'Test_server_crash()',
       \ 'Test_state()',
       \ 'Test_term_mouse_double_click_to_create_tab()',

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2162,
 /**/
     2161,
 /**/