ci: skip tests that fail on windows

test/functional/terminal/window_spec.lua

@@ -18,6 +18,7 @@ describe(':terminal window', function()
   end)
 
   it('sets topline correctly #8556', function()
+    if helpers.pending_win32(pending) then return end
     -- Test has hardcoded assumptions of dimensions.
     eq(7, eval('&lines'))
     feed_data('\n\n\n')  -- Add blank lines.