ci: fix flakey test on Windows

Author: ibhagwan

tests/actions_spec.lua

@@ -141,6 +141,7 @@ T["actions"]["vimcmd"] = new_set({
       __expect_lines = true,
       __after_open = function()
         child.wait_until(function() return child.lua_get([[_G._fzf_load_called]]) == true end)
+        if helpers.IS_WIN() then vim.uv.sleep(250) end
       end,
       no_esc = true,
       search = [[Copyright \(c\) -- LICENSE]],

tests/win_spec.lua

@@ -275,6 +275,7 @@ T["win"]["toggle"][""] = new_set(
         __screen_opts = screen_opts,
         winopts = { preview = { hidden = true, delay = 0 } },
         __after_open = function()
+          child.wait_until(function() return child.lua_get([[_G._fzf_load_called]]) == true end)
           if helpers.IS_WIN() then vim.uv.sleep(250) end
         end,
       }